I also asked him about what hand beats what. I think it does not matter what I tell him, he is doomed. As he told me, he is going there to lose money. Well I gave him a crash course but am pretty sure he did not listen all that well, 21 you know! I did give him the best advice I could think of though and made sure he listened: Go with a set limit that you are willing to lose, with your spending money for food, drinks, clubs, gas kept distinct from what you are willing to lose gambling. Then when you gamble, take it slow and easy at first, if you lose a big pot, especially because of a dumb mistake, do not get mad and try to win it right back. Just try to win, not to win back any loses, and if you lose, never - absolutely never - take money out of the other pocket to try to win back all of your lost gambling money and never use the ATM, credit card, or borrow money to try to win back losses.
I cringe at the thought of how much he may lose but who knows, maybe he will have a role reversal come back as Elmer J. Fudd - millionaire, owning a mansion and a yacht - I just hope
All the best,