Seeking feedback about how to create proposal to a private lender

[Dave P.]

As I have grown in my REI journey, I have been able to join a Massachusetts based group of 55+ real estate investors of varying backgrounds. Recently I sent a thoughtful email to the group about my desire to build a long term relationship with a private money lender in which both parties can find some value. I told them that I have identified some solid property and have run the numbers using the BP rental property calculator. I got some positive interest. Should i craft a business plan or some other document or am I overthinking it? Can it be as simple as "I've identified this property and wonder if you will give me the 20-30 percent in down payment money and in exchange I will give you x percent in interest. Thanks for your constructive feedback