First, my condolences.
Usually pensions are treated as ordinary income for the pensioner, so my guess would be that it would be ordinary income to you as well. You'd avoid FICA taxes, but you'd pay both federal and CA state income taxes, either on the lump sum this year or on the monthly payments in the year you receive them.
If you have a tax program that you use, you can simulate the effect on your taxes by adding a fake entry as bank interest and the tax effects should be the same.
As far as whether to take the lump sum or the monthly payments, part of that decision is probably how much you can use the money now versus later. If you're indifferent about that, it looks to me like the implied rate of interest is about 2.07%, so you can think of it as having a bank account with the $23,xxx in it which will pay you 2.07% between now and 2035. That's a nice interest rate now, but if you took the money and invested it you could probably beat that rate over that time period.
The other thing to think about in terms of lump sum vs. monthly payments is the taxation, as alluded to above. If you take the lump sum, it'd all be taxable this year. That may not be so bad if your income is relatively low this year compared to what it will be over the next 14 years. Taking the payments spreads out the tax impact over the next 14-ish years.
From a quick Google, Colorado does not have any estate taxes, and if you live in California it looks like you don't have inheritance taxes. Your Mom's estate would be subject to federal estate taxes, but the exemption amount is currently $11.7M so it's likely there will be no federal estate taxes. So that money should come to you completely tax free. You should consult with an estate attorney or a tax professional to be 100% sure, though.
There's no tax benefits per se to rolling the pension into an educational trust. You'll get whatever benefits from the trust or 529 just from putting whatever money you put in, but there's no special benefit for going from the pension to the trust -- you'll still be taxed on the pension income regardless, and then whatever you do with that after that point is not connected to a trust or 529 in any way.
You may want to double check your understanding of 529 account rules. I believe they can be used at any school which does federal loans, which definitely includes some foreign universities and - I think - some domestic trade schools. Please also educate yourself on the income tax rates on trusts, because they are quite high, so you may end up sending a lot of your child's education fund to the IRS if you go the educational trust route.
Hope that helps; good luck.