How to draw a business plan for rental property

Hi my name is Daniel. I have set a personal goal to start investing in rentals (2020). I have been talking to some people in my community about it and one person in particular offered to give me some financial assistance if I drew up a plan on how I will invest. I am new and have been learning on the BP website and doing my research reading about investing in rentals. I was thinking of using the four square method but I’m not sure if that would be a good enough plan. I am just looking for advice from people with enough experience in this field. Your help is highly appreciated.

Thanks