I like this guy and don't know what to do.

There is this guy in my school. He’s a year older, but we’re in the same grade, because I skipped 1st grade. I like him a lot and have since last year. What should i do? I put a letter in his locker saying that i liked him and he said he liked me back. I guess this should be enough since we went on a “date”. I want 2 keep our relationship moving. I’ve known him for 1 year and am positive I want 2 be with him. Please help!!