Starting poker site - business contract

[Gimmicky]

I and my two associates (one of whom I know very well and can basically trust anything with, and another who I trust but don't know well enough to know how far to extend said trust) are in the process of moving from the poker affiliate market to establishing our own poker site.

We have financing, a business plan, and a good user base.

The thing is, none of us have any experience in writing professional business contracts...

Any tips on how to formulate the contract and what should be included in it to ensure maximum security for all parts involved would be greatly appreciated.

I realize that this might be a little vague, but I'd prefer not to divulge too much details about our enterprise at this point.

Thanks.