Jesus. Got my house 7-years ago on a Habitat for Humanity mortgage, for which you pay cost. ~85K? Also, no interest on the loan. Also, no property tax.
3-bed/2-bath/80'x200' lot/1,140sq. ft. living space/$550mo.
Call your local Habitat chapter, go to the next meeting and learn. Keep going with the program if you can. Took my ex-wife and I 14-months, start to finish.
I can't tell you the qualifications, they change and are different from one area to the next. I can give you some basic answers, at least I'll try.