How do I approach a guy I like?

So a while I met a boy at a local Easter egg hunt. Me and my brother arrived late and he came over to us and gave me some his brothers. I notice he look my age and ask him if he went to the local high school and he said he did. Fast ford to now and I have not talk to him since even though I saw him walking by me couple times last year. And this school year I see him in the hallway at least three times a day. I found found out he was a senior (I'm a junior). So we have no classes together and nothing in common. And every single time I see him I look away even though I have genuine interest talking to him and getting to know him. But I have don't really have the confidence to go up to him because I have no idea even have to start the conversation. Please give advice.

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Updates
+1 y

So the only things I now about him is his name ( he did not tell me this I found out from the yearbook). And that he is really smart and is into skateboarding, snowboarding , and skiing (all this I found out by asking around ).
How do I approach a guy I like?
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