When to get Purchase Sale Agreement Signed by Seller?

[Arthur Means]

Hello, I'm new to Wholesaleing. But I don need some clarification please. Once I find a property and contact the seller, should I walk through the house to see what repairs are needed before I get the Purchase Sale Agreement signed by the seller? Or is that done after signing the PSA Contract? I would be looking to complete this deal as an Assignment. I would appreciate any helpful responses.