First thing I would like to say is congrats for going back to school and trying to start your own business with some of the odds that are against you. One thing you may want to strat with is your local DHS office. Your fiance is a single father they should be able to help him with food, medical and possibly some of the home repairs. Its not looking for a handout, but simply using resources available to you when you need them and as long as you don't make a life of it that is ok. With some things if they cant help they will help you find someone who can.
In regards to your business, check your college. I attend school in Michigan and my college has an office right on campus that helps with small businesses.
I hope this has helped you somewhat