How can I talk to my crush when I ve never actually said hi to him?

For a while now I ve liked this kid. But I ve never actually tried talking to him. He s in a lot of my classes and I m trying to figure out a way to start a conversation with him. I don t sit next to him in any classes so it makes it kinda hard to talk to him. I really wanna try to get to know him and I really want to ask him out but I m not quite sure how if I can t even talk to him XD. I m very socially akward so I find it quite hard to walk up to him and talk to him. Besides I have no clue what I would even say to him.. would it be weird if maybe I wrote a note and somehow gave it to him and it had my number on it but not my name..? It would most likely say something about someone liking him or whatever.. or would that just be too akward..? anyways could I have some advice in how I should get to know him? And maybe even ask him out?