T.F.
Check with the school districts to see what you need. I'm in Plano and I have subbed at the same elementary school since 2000. I could easily be there 3 + times a week but I prefer 1 day at most because we run our company from home.
Subbing is my "outlet" from the 24/7 micromanaging our company. I love it.
You might want to start as a sub to see if you love it. Secondly, they have aide jobs available as well where you are hands on with the children.
Another option is working for a Mother's Day out program.
I don't know the "rules" for getting a teaching certificate. I know with a college degree you can sub.
As for Financial Aid, that should be done through the place where you get your certification.
Best wishes to you! A LOT of subs have gone on to get certified for teaching. I love it...it is very rewarding to me.