So I applied to UF for the fall but was accepted for Summer B. Can I choose what classes I want to take during those 6 weeks or will they choose it for me?
Yes, you can choose. I recommend getting the art studies class out of the way.
You get to choose, during Preview, with the advise of an advisor. 
Is there a way to find the summer b required classes for freshman? My son was accepted to summer b. I can’t easily find the list–like the art studies classs you mentioned.
I highly reccomend summer B to anyone 100000 times over… Also, if you can get it at preview, TAKE GOOD LIFE!!!