Replying to Selling on Newschoolers

This tread is for opinion of NS members and for Mods to let me know how things are.

So pretty much I plan on designing and making my own Tall T's and regular T Shirts. They will be as good quality shirts as any other. I will be open for requests on custom graphics and such which I plan to charge a little extra for.

My question is, will I get in trouble with the Newschoolers authorites for selling my own products on this website. If so, how can I get around this "legally" so I'm allowed to do so?