Hi - I am a bit older than you, but a similar situation. I'm not sure if you are the main wage earner or not from your post. I am lucky in that my husband has health insurance and a good salary, so we did not have to take out any loans for living expenses. I was working full-time as a pharmacy tech before starting school, so I have taken a significant pay cut (only working 4 hours a week right now). However, this is the first year that we did not have to pay child care, so those two things sort of offset themselves.
Couple of suggestions: 1) before you start school, if there is any possible way reduce your debt load. The only debt we have now is the home loan - no car loans, no credit card loans, etc.
2) Be sure that you aren't spending money on items you could do without. I've posted on this subject somewhere before, but basically just assess all your monthly bills and see if you could eliminate or reduce them. How much do you pay for cable? Cell phones? Alarm system? Gym membership? etc. Do you have very expensive hobbies, or do you go out or entertain a lot? You will probably want to cut back on that (and you won't have nearly as much time anyway!)
3) Remember that when you do the financial aid for school, they will assess your need just as if you were single with no dependents, no house, you were traveling back and forth to school, etc. I was very surprised to find out that my total financial package contained a lot of things besides just tuition, with the net result being that I qualified for much more loans than I was expecting. We ended up choosing to accept the subsidized loans (no interest) and did not take the ones that required interest prior to graduation. At least for the first year, we choose to pay the difference from savings.
4) Your school might have some payment options that would be helpful. My school has a deferred payment option, which allows you to pay your tuition over a 4 month period, one payment per month so we don't have to come up with the entire payment in one lump sum at the beginning of the semester.