Showing Affection

Act like you're interested in what he has to say. Hopefully, you already are. As long as you're talking, he'll be able to suggest more if he's interested. Try to make your act match your attitude toward him, rather than reflecting any hidden fears or negativity you might have.

Biggest hint that I usually notice first is: "I miss you"

Besides that, (I'm guessing your in school) try to be with him as much as you can. If he only see you a little bit he won't even thinkg about you liking him. If suddenly your with him all the time he's going to finally "Get It."

Laughing at everything he says even if it's not funny at all is a pretty good indicator too.

I totally freaked out my current girlfriend with that before we got together. I said "Why do you keep laughing at everything I say even if it's not funny, we're talking about freakin post-it notes." There was a long pause and she started blushing and looked down, and then I gave her a huge and said " It's ok, I really like you too." She keeps telling me to this day how much that scared her at first.

Ok, here are a few things I've done for my boyfriend
I drew a heart on a piece of paper and wrote him a short note saying that I was thinking of him and I love him. (he still has it in his wallet)
He likes having pictures of us together so when a new one was developed I put it up in his locker without telling him.
I also left a hershy kiss in his locker, right in front where he could see it.
I've also sent him quite a few emails for no reason other then just to tell him that I love him

He really likes little stuff like that! ^-^