Some advice concering Seller's assist for a client

[Luis Rosario]

Hello my Bigger Pockets friends,

I wanted to pick your brain concerning a buyer client I am working with who has a particular situation.This client is very interested in buying her first home. She takes care of several children and receives a good weekly paycheck. However, it is payed in cash by her own clients, so she doesn't have ample documentation to qualify for a bank loan.

I've been thinking of helping her with a seller's assist and wanted to see if there are some good ways of going about this. There are many homes in my market that sell for 20-30k, plus my client has a 12k down payment already saved.

Thanks in advance.

-Luis