Talk to him, ask him out, do the hair flippy thingy once (but not twice. That's twice too much.), don't bake him a cake, don't bat your eyelashes, don't giggle, and be yourself.
Honestly, this an issue you need to resolve yourself. Don't mean to offend, but you really don't need everybody's opinions on what to do in a romantic situation. There's areas where opinions are necessary, but in these, the only one that matters is yours. You need to decide what's best, not what others say is best. If you want to stay in that relationship as "just friends" that's fine, if not, that's fine too. You just need to stop being dependent on the thoughts of other's and take some initiative and be happy with the results.
Just be yourself. Try like bumping into him in the hallway and acting really sorry. He might catch on....jk idk if that would do anything
I tried doing the bump into them trick on a chick. But then she asked why I walked 10 miles to her house and randomly bump into her.
Throw your books at him. That's what that looked like blockey. Then ask him to pick them up. But then he'll think you're clumsy... You know, if you asked for ways to get a guy NOT to like you, it'd be easier. But what Chewie said