Senior in high school... best way to build credit?

[Alden Tinder]

I’ve been looking at investing into real estate for almost a year now. I could pay cash but I thought to myself with such low interests rates why would I want all that equity tied up. I’d like to think I’d be able to get a loan somehow somewhere, is this possible with out a credit score? Maybe a larger down payment then the typical 20%? I plan on getting a rental something that needs a little work, but not too much.

I’m interested what people have to say or their experiences, thank you!