Big 4 Accounting Firms Advice

[magflo]

"I should be CPA eligible around the end of my Junior Year, as my total credits should equal around 150"
What state are you in? Usually CPA eligible requires more than just the 150 credits.
"I will be graduating high school with an A.A degree in Liberal Arts, are there any jobs I can obtain in the Accounting field, that I can work part-time while in college, that will add to my resume?"
Congrats! Have you taken basic accounting and econ classes in your AA degree? Check auto dealers and large grocery chains near you. Often they have positions like "accounting clerk" that you could qualify for with just your AA.
" Lastly, how do I stay motivated, as I will be pursuing 3 degrees at once? Will this be a waste of time?"
Unless you're intrinsically motivated to do this I think it would be a waste of time pursuing add'l Bachelor's degrees. If you're going to attend a B&M school for your Accounting degree your time would be better spent working hard at your classes, working a part-time job as already mentioned, volunteering in your community and participating in your school's activities like the Accounting club.