What are so subtle things I can do to show him I like him?

Don't drop subtle hints. Just familiarize yourself with him, talk to him, say hi, wave, etc. Personally, I think subtle hints can be confusing.

First of all, most guys get really confused about girls' motives behind what you girls do. And sounds like you have a similar situation here too. You definitely got the eye contact part right. And when he does flirty things with you, try to flirt back, even if it's just a little, it'll help a lot. Aside from that, TALK to him. Talk to him in the halls, or at least say hi to him. And if you have his screen name, IM him. You'll eventually get your message through

What about adding him to your myspace/facebook or the like (if you have either). That is an excellent way to get to know him one-to-one. This especially good for people who are shy. It is difficult to get any closer to him or flirt with him unless you get a chance to communicate with him more often. From the sounds of it, it doesn't look like you are getting too much opportunity to do that. Believe it or not, sometimes flirting in 'words' can be very effective. Especially for shy people. Once you begin talking with him more then ask him out for something short (i.e. Ice cream, coffee etc). I don't think a movie is the way to go just yet. You need to open up those communication channels. Ask him for his contact info, let him know that it would be nice to talk to him a bit more since you don't get too much of a chance in school. I am sure he would be really happy to do this! Good luck :)

Talk to him around his friends and just hug and touch on his shoulder stuff like that and he'll get the message soon enough

Why don't you want you talk to him when his friends are around? Personally I think if you see him in the hall and he's with his friends just walk up and be like" hey hows it going" it will show him your confident enough to acknowledge him when he is talking to other people, introduce yourself to his friends, it will show that your interested in getting to know not only him but the people he hangs out with, its important for him to know that you will get along with his friends. Its ok to show some subtle hints but not to subtle, don't forget boys are sometimes oblivious to how a girl is feeling unless you just come out and say it. But I wouldn't just walk up to him and be like 'hey I like you' that should wait until your alone. But when you see him ask him what he's doing that weekend. If he says nothing then be like 'we should chill' don't make it obvious you want to be alone, if he asks you to do something with his friends. Go for it. Just be yourself. If the feeling is mutual then show it. But don't back off just cause he's with his friends.