Whole sale contract

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Is there a site online where I can have a lawyer write up my wholesale contract so I can make sure I am fully covered.? Also I am just starting out. So I do have a few questions if anyone would like to answer. One- when I find an investor to wholesale my contract to, do they pay me or pay the person who's house it is?

Two- Do I have to tell them how much I got the contract for?

Three- Do I have to tell the seller how much I wholesaled it for?

Thank you to anyone who can help me with these answers.