Staking Agreement

[stunnersuh]

Hey guys, a good friend of mine wants to stake me for some low limit cash games. He wants to start up a new account with $1000 in it, on PokerStars so I can multitable 50NL FR.

We're both keen on the agreement, but we are having trouble figuring out what a good percentage is that I should take of the potential winnings? I have been a fairly solid winner at 50NL and 100NL on Stars.
We really have no clue as to what is a fair deal for both sides. We plan on running this stake for a few months or so. Thanks for any input guys.