Seller financing--how is this done?

[B R]

I am a newbie working on 2nd SFH deal, which will become a rental. I would like to put a request for seller financing in letter of intent to purchase, but don't really understand how it works. Who does the paperwork to set up the note? Would the seller use an attorney, accountant, etc.? Or am I just sending some lady a check for 30 years? I would like a firmer understanding--can anyone advise?

Our first deal went so well and we have excellent tenants, thanks in large part to BP and all the great comments and suggestions we received! Thank you!