I am in Idaho as well and was divorced in 2006.
Amicable resolutions are best for everyone in both the short and long term. I would highly recommend that you seek out a local mediator who is also an attorney. They will be able to give you an independent assessment of what is reasonable and unreasonable in the eyes of the court. They will be able to come up with creative solutions to sticky issues. They will be cheaper, faster, and more deterministic than a contested divorce. They will work to create a documented agreement between the two of you. If you are in the Boise area I can give you two recommendations; feel free to PM me.
After you have that mediation agreement, one of you (probably him) will need to actually file for divorce. If there are no disagreements at that point though, it is pretty straightforward and quick.
In Idaho, the default assumption is a 50/50 split of assets regardless of pretty much anything. It doesn't matter who earned the money, who stayed home with the kid, who is at fault for the divorce, or who is initiating the divorce. But you can split the various assets and liabilities any which way you want as long as the total is 50/50. With liabilities, even if you have a divorce decree, you are still liable, so you want to ensure that either you take the debt or that you are comfortable with the mechanism for getting your name off those debts. It would be typical for the house to be sold and the mortgage paid off before the divorce is final.
We got fairly close to 50/50 just by divvying up the various things, then I made a special transfer from my IRA to her IRA to make things exactly 50/50. This transfer is allowed in divorces and there is no tax consequences to anyone at the time. Google QDRO (Qualified Domestic Relations Order).
In Idaho, there are also child support guidelines. Google Idaho Child Support Guidelines and you'll find the document. It's pretty straightforward to read and understand. These guidelines are expected to be followed in the vast, vast majority of cases. The inputs are the percentage of time the child spends in custody of each parent and each parent's income, plus who will be taking the tax benefits (dependent deduction, child tax credit, etc.) and the health insurance costs. It all goes into a formula and a number pops out. The court is required to document this amount and I think they may even have to justify any other amount. In other words, the amount the ICSG calculations produce is the strongly presumed default correct amount.
Added comment: The website that others have linked to is not an official court website. It may be right, it may not be. I'd go to the authoritative source, which looks to me to be:
https://isc.idaho.gov/files/ICSG-July_1_2012.pdf. Your local district court will have official calculation resources as well that they can run for you.
You will not be allowed to set up an account and put money into it as you are hoping; what will happen is the net child support payer will send a check to the Department of Health and Welfare, who will then turn around and send the money on to the other parent. This enables the court to monitor, if needed, that child support is being paid correctly.
It doesn't sound like it will happen in your case, but parents are strictly forbidden from using child support and child custody as weapons. In other words, you can't keep the child longer if he doesn't pay child support (or vice versa).
As alluded to above, child support also includes payments for medical insurance for the child and any adjustments for tax benefits - usually the higher earner takes the tax benefits and compensates the other parent for a portion of those tax benefits.
Beyond that, out of pocket medical expenses and child care expenses can be paid directly between the parties according to the ratios of their incomes.
Either party can go back to the court at any time and ask for a modification to any and all parts of the agreement. To do so, though, the child support payment must be recalculated on the then current incomes. In Idaho, child support is typically paid until the kid graduates from high school.
College is not accounted for in the guidelines. What we did was I took the kids' college funds, but they didn't count against me as assets with regards to the 50/50 property division, with the understanding that the money was for their college and not for my personal use. It was not enough for their college at the time of our divorce, so I just decided to pay for their college myself and have saved enough to cover it. If my ex chips in, that will just be a bonus. You could have some term in your divorce agreement about college; personally I chose not to.
As alluded to by others, in Idaho, any separate property can be set aside for purposes of the 50/50 property division. This would include inheritances and gifts. However, the property must have been kept separate; if it is commingled in any way with marital assets then it loses that character.
Consulting with an attorney is wise. Most divorce attorneys will give you a half hour or so to ask any questions for free as a way to see if you want to work with them. Keep in mind, though, that attorneys have a strict code of ethics so if you discuss your divorce with Attorney A, then Attorney A will not be able to represent your husband (the reverse would also of course be true). I would add, though, that the mediator, if they are an attorney, can also answer basic questions about the process. The Ada County court system also has people who can answer general questions (it's called the court advisory service or something like that) about how child support calculations work, about the timelines and requirements, etc. They just can't give you legal advice.
@Frankies Girl mentioned no fault divorce. In Idaho, it is required to give a reason for the divorce. There are six or so "real" reasons, such as incarceration, lack of support, etc. And then there is "irreconcilable differences", which is I think what is used most of the time. Idaho is a no fault divorce state in general, though, which means that it doesn't matter who did what to whom when - all the courts care about is that someone is requesting a divorce.
Someone mentioned the house value. I think selling it is smarter (that's what we did), but if you don't sell it, you can get it appraised and include that value on the property division ledger. The court doesn't consider the subtleties of embedded costs like selling costs or tax liabilities on traditional IRAs; they assume that the parties have considered these things themselves. Anything you two come up with that you agree to here will probably work.
If one of you keeps the house through the divorce you should require the other party to sign a quit claim deed. This gets their name off the house on the ownership side of things. The mortgage, as noted above, should be paid off or refinanced.
If he's starting a job in August, you likely will not owe alimony. Discuss this with your attorney.
Legal fees before the divorce are paid out of joint assets. Legal fees after the divorce are the responsibility of the separate parties. Mediation after divorce is traditionally paid 50/50, but I don't know if there is a hard and fast rule on that.
Idaho does not have a trial separation, and in fact does not have any official recognition of a "separated" state. There is a 20 day "cooling off" period between when a divorce is filed and when it can be finalized.
There is a boilerplate language that the judge will attach to whatever specific divorce agreement you develop that says that you are not supposed to disparage the other parent in front of the child, and that you're not supposed to communicate with each other through the child, and other similar language. This has legal force and anyone violating it could be held in contempt (although it is uncommon, it's a good way to keep people in line). What I think you will find is that the courts put the child's welfare miles ahead of the parents and does what it can to protect them.
Hope that helps. Sorry you're going through this. It does get easier over time.