What should i do first?

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So im looking for a seller financing deal

But what do i do if they are able to finance me their home but i havent done an inspection,liens,equity,mortgage, etc?

Do i have to do all that first? Like what if i do all that and then the seller says no?

Do i have to do all that first then ask for financing? Or what if they say " yes "

Then i spend 500 for an inspection and then he says " i dont want to sell it anymore "?

Ill be making payments on the house for a few years then ill buy it ( sanwhich lease )

So i could buy it or maybe not.