there is no such thing as a license as far as i know of. you do need permissions from people and property if you sell it commercially, but as fine art i should be ok.
$30 will get your your own website, unlimited uploads, i think 10% extra on frames if someone gets one, and i think a shopping cart for facebook. mostly your stuck at 25 images for basic.
either account you will get the amount you mark up. you want a $100, you get a $100. don't forget to advertise yourself.
---Mike Savad