Private Investor Interested in Loan with 7.5% Interest, no lien. How to structure paperwork?

[Mike Cowper]

Kind of what the title says - I have a private investor who is interested in issuing a loan for 12 months with a simple interest rate of 7.5%. How would I structure the paperwork so it is legal and binding? The investor is someone I know and trust, so I am just looking for something simple to have us sign so there aren't any issues anywhere down the road.