That sounds like a decent plan, Kas. Take the plunge! And the monthly stuff is tricky, but you CAN change the contributions. I highly recommend getting a good program for keeping track of your finances (Quicken, MS Money, even Excel). That will help you make a budget and see how much you can contribute.
With regards to education, first, know that if you contribute to something like a 529 plan, you often MUST use the money ONLY for education. So, if you have kids and they decide not to go to college, the money just sits there unless you want to use it to fund a niece or nephew (or stranger). Not all plans are like that, but keep it in mind.
Go read a financial planning book. I like Smart Women Finish Rich (the updated version is probabaly the best of the series...very warm/fuzzy/supportive, but educational and not condescending). Learn how to make your money work for YOU!