Help with Seller Finance/Owner Finance?

[Ana G.]

I'm a wholesaler in Miami Fl and when sellers call and ask for retail, I used to be forced to move on (mostly because the seller still owes a mortgage close to retail price). So lately ive been saying, yes we can give you full market but you have to seller finance/owner finance for 20 years.

Does anyone know how this process works? Does anyone have the contract for this type of deal? 

Would a mortgage assumption be even better? Does anyone have the contract for an assumption of mortgage? 

When would i get the deed? Help would be SUPER GREATLY appreciated. I literally have 5 sellers who are interested. HELP!