I think about 8-10% will deposit from the registered players. This will vary a ton depending on the quality of the site though. I don’t know much about Everest but I think it is a low traffic site. Players want lots of table selection and cool software. I would expect a much smaller profit from Everest versus a bigger, busy site.
Average per player is hard to figure until you start doing some volume. If you have 9 small players and one big one the average might look okay but then you lose the whale and your average is weak. If you have 500 players then losing one biggun won’t mess up your average.
I’d sign up some busy US friendlies. Poker.com, Absolute, Ultimate Bet, Full Tilt.
Good Luck.