Wholesaling question

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Quick question. What would be best thing to do to show an end buyer a property or properties of a spread sheet of what the numbers can or would look like in regards to wholesaling. Should I show him before he signs the contract obviously or after the contract should be signed. I would think before so he gets the gist of what he's looking into but want to make sure to the person who wholesales more frequent than I do. Any advice will help. Thanks.