I do have other sources of income... a home biz and child support. I have pared down my budget so that I am living on about 30% of my total income. But this is all very new to me (having excess income) and I am not sure where to start when it comes to saving. I know we need to have emergency cash, but how much? Is it cost of expenses multiplied by a certain number of months... if so... how many? And once I reach that amount, should I then go back and work toward maxing out my 401K? Or is there a step in-between that I am not aware of?
You can take a couple of approaches towards building an emergency fund... 1) save 3-6 months' worth of base expenses (rent/mortgage, utilities, food, gas). This will cover you should you briefly lose your income source and need time to change gears and make adjustments to another job or other living situation. 2) If you feel confident in you income sources staying steady, save the amount of money in your emergency fund up to what your immediate cash needs would be to pay your insurance deductibles if everything happened in a short amount of time (ie. medical emergency, car accident, etc). For example, if you carry a $1000 car insurance deductible, $5000 home deductible, and $1000 health insurance deductible, an emergency fund would need to be $7000 (maybe $8000 to cover minor car repairs, etc). If you choose #1, you can always sell some of your invested funds to get the money you need (if it exceeds your saved amount) but if you prefer to leave it untouched and self-insure, then #2 may be the best way to go.
Personally, I've changed from #1 to #2 as I was able to save enough to cover higher deductibles (thereby lowering monthly premiums and allowing more money to be invested and grown) while growing a larger investment portfolio. Over time, I felt like the money saved in excess of the deductibles could be better served in an index fund and growing, and I was more willing to risk it in a more aggressive investment than a savings account.
Either way, I feel you should do what is most feasbile to you at the moment (financialy) considering your potential financial obligations in the big picture and your risk tolerance. Others on this board may have some differing opinion on this strategy and I certainly would love to hear their perspectives as being open to change and embrace new strategies will only lead to a stonger foundation and success.
As far as the 401k goes, I would take advantage of getting into it now while working up that emergency fund.