How to pitch an offer to get your deal under contract !!

[Tarik Sapp]

I walked through this guys house for repairs, he’s motivated to sell, he’s moving out of state, I told him I’ll get back with him after I crunch numbers...

Can someone please help on the best pitch to start negotiating with the seller? Do i just throw out a number or ... say something like “ After reviewing our numbers we came up with and repairs cost we can offer you ...”