California Seller Financing Purchase Contract / Addendum

[Justin Koopmans]

Hey everyone! I'm in talks with a private seller to purchase vacant land. We have been talking directly without agents. Three questions: 

1) do California Realtors have a seller financing addendum that they can use? 

2) is there a resource that someone could point me to for a customizable seller finance contract template that we could look into?

3) Any CA attorneys out there experienced in seller finance purchases that you could recommend? 

I looked at Law Depot online but that template won't work for us as it requires an interest rate to be input. Our terms may not have an interest rate attached to it. The current discussion is that we'll agree on a payment and then "x" amount of each payment (same every month) will go to principal (instead of following an amortization schedule). 

Thanks!