1 -- lol go to town on the shirts, just thought id help you out with a little heads up, what you are doing is about to break the law
2-- not pre law, actual law
3-- this is a real statute and regulation. Don't believe me, just google the codes 17 USC section 106 equals copyright infringement. 17 USC 107 us an affirmative defense of fair use.
4-- ND is not that one that would come after you, it would be Warner Bros who owns the copyright. So she's right, ND couldn't care less, but that company is California, which has a strong case history of prosecuting copyright infringers (due to movie stars, entertainers, multi trillion corporations like WB) reside there. Bazinga and Sheldons likeness means WB ... Louis' likeness is probably on par with what BGIF said with NCAA owning the property of student athletes.
5-- thing about law school, every one is do busy and so stressed, that sex us the second most productive
... But again too each his own, is suggest looking into this a little more than what you have