How can I prepare for financing at age 20?

[Jaden George]

I am 17 years old and trying to do everything possible to get ready to jump into REI by age 20 with a small multi family property (3-4 units) in my college town that would allow me to house-hack. My main problem is preparing for the financing on the property. The FHA loan seems like a good choice for me though I could likely afford the down payment on a 85-90% LTV loan from a portfolio lender if the FHA is too strict.

Assuming that I will be a 20 year old student with a standard w2 job, I doubt that lenders will jump at the opportunity to lend to me.

What can I start doing and thinking about to create the best chances of obtaining a loan from a lender at age 20 with less than ideal income?

Thanks guys!