DO it for YOU, if you feel like you need or want to do it, what everyone else "thinks" or "says" has no bearing. Yes, the Bachelor's degree would open the door to more possibilities for jobs in the future, and you don't have to complete it IMMEDIATELY, but just get started with the associates and get that mini-goal doen, and then re-evaluate from there. If you still wish to go on afte the AAS, go for it, do it a little at a time, so that you aren't overwhelmed, and so that you can finish it by the time you are comfortable not being home for the kids after school ( maybe when they are all in high school or above?) so that by that time you will be able to go get a decent paying full time job with your completed degree!
Have you looked into online schools, or schools in your area's online offerings? Does University of Wisconsin have anything online you can take towards the area you are interested in?
If your kids are still young, and you want to be there before and after school for them, it is going to be hard to find a job that will accommodate that, but a part time college schedule may be able to be worked into your family's schedule, so that you are in class when they are at school, and home before they get home.
Oh, and you said you might want to be a substitute teacher, but you can't do that till you ahve a bachelor's degree. Here is a possibility before then, and a foot in the door wiht the school district for later if you were to get your Bachelor's:
http://www.bls.gov/oco/ocos153.htm , Teacher's Assistant, info from the Bureau of Labor Statistics.
Good Luck and More Power to YOU!
Jessie