Congrats on deciding to go back to school! That is a wonderful decision.

However, I would suggest that you spend some time in the classroom before you devote a lot of time and money towards something you may not like. I think it's very important to like children if you work with them- they can tell if you are not "into" the job and will respond in kind! (I am currently teaching 1st grade).

Also, I think in all states you need at least a bachelor's degree to get a sub license (due to NCLB), while you really only need a high school diploma to be a teacher's aide. I'd encourage you to apply for a teacher's aide position now if you are interested in that.