Seller finance contract

[Andrew Lemmie]

I am looking to put together a offer to purchase a property doing seller finance. I have no experience with seller finance. 

I have spoken to the woman that owns the home and she seems interested but I'm not sure what my next step should be. I think I would just write up an offer then present it to her for negotiations.

Where do I get contracts? Would a generic contract work or should I talk to a lawyer? 

I live in MN, is there something I should consider or know about seller finance specific to MN?

Thanks!