Hello satyakam, nice to hear that u also going to start ur own forum..
My suggestion is -

The rate. I think the favourable rates for members are at least 3 cents per post and 4-5 cents per thread. The more, more if u gave us then its supper... The rate is depends on u only... If anybody scam in ur forum then - their points also..

But the minimum payout should be low.. like $2 to $10 ... not more than that.. and whenever anybody request for payout... then don't take so much time dear... as soon as possible do it.. Quick payment gives u lots of members as well as raputation also... :wink: