Im not a Instructor and I can already see I've left out some points but yeah the gee is your best friend for leverage. I would definitely not tell him him to pull guard till he knows how to work from bottom.
"I fear no man, but Jim Harrison and Mike Stone are the two last men that I would wish to meet in an alley fight. Jim Harrison's fighting style is not flamboyant or spectacular, it's just simple and deadly!" - Bruce Lee