How do I talk to the boy next door?

There's this boy next door that I'd like to get to know, to become friends with. I don't really have friends in my neighborhood or at school. It would be nice to have someone to talk to.
I've seen him and his brothers in their yard fixing their cars sometimes. They live right next door. But they are never outside when I am. So how do I talk to them? What about when we are in our yards at the same time? I don't want to just stop what I'm doing, go up to him, and get his attention. Or should I?
I just want some friends, or maybe something more if that's what happens to happen.
I've been trying to see when they are outside, but when they are I don't know what to do. Wouldn't it be weird If I just ran outside of my house to greet them?
How do I talk to the boy next door?
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