Help with structuring seller financing

[Michael Morrissey]

Help me BP, 

I'm an investor in MA and I currently have a lead on a seller financing opportunity in my area. This will be my first time putting together a deal like this and I'm unsure where to start. Great news is the seller is open to options besides all cash,  but what's the best way for me to present my offer. My agent mostly deals with traditional financing and does not have much experience with seller financing. Should I go find another agent? Have a lawyer write up and offer? What's my best next step? I would appreciate any advice you can give BP!