experienced STAKERS i need your advice

[Hobb]

wahts good, all...

i'm providing a $2000 stake to someone. I am also paying for (i think) their purchase of pokertracker and PAhud.

hoewver, i've never done a stake before, and am not sure what terms to offer about splitting his profit (which, btw, i'm sure will be a lot lol)

in general, do stakes last a certain amount of TIME, or is there a ceiling to how much he makes after which he goes off on his own? Is a basic guideline for him to be left with as much as I initially staked him - i.e. he makes $4000, i take 1/2 that + my initial stake.. so i come out ahead 2000 and he comes out ahead 2000?

Or should I say when he's +2000 he gives me 3000 and he's left with 1000? Or should I say when he's +10,000 he gives me 7000 and is left with 5? What if over the next 3 months he makes like 1k? should i be able to retract my stake and leave him with 500$?

ANy advice on appropriate staking guidelines would be great.