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If you really like this boy, tell him that. Figure out what you want this note to achieve. Do you want him to give you his number so you can text him? Ask for his number in your note. Do you want to hang out with him after school? Ask him to come over to your house to watch a movie. Figure out what you want to achieve with your note and writing it will become so much easier. Be honest with yourself as well. Don't tell him it's okay if he doesn't like you, you're okay with just being friends if that's not true. Make sure whatever you put in your note is truthful, otherwise you're starting off on the wrong foot. It's also okay to say you don't know what to say. Telling him "I don't know how to tell you this, but I really like you" is very endearing and he'll be flattered that you were even brave enough to try. There's no right way to tell someone you like them, so you can feel free to be as creative as you want. Try writing a poem to let him know how you feel. Your poem doesn't have to rhyme if you don't want it to. There are many different types and lengths of poems, so fool around and see which one feels right for you. If all else fails, go back to the classics. You can't go wrong with a little "Roses are red, violets are blue, this poem is stupid, but I still like you." If you have trouble putting what you feel into your own words, use somebody else's. Include a quote from your favorite movie or book or add a song lyric that makes you think of him. It doesn't matter what you say, as long as he gets the idea that you like him. Use your note to express things you might be embarrassed to say in person. Compliment his hair or his clothes or his personality; whatever it is that makes him attractive to you, tell him. Even if he decides that he's not interested in you, he'll still appreciate the compliments. If you and your crush are already friends, chances are you have at least one inside joke. Include that joke in your note; these details are unique and specific to your relationship and he'll appreciate that you thought to include it. Your love letter doesn't just have to be a letter. If you feel self-conscious explaining yourself in words, try explaining yourself in song. Make your crush a mixed CD or playlist of all the songs that make you think of him. If you're artistic, draw him a picture of you and him together. Whatever you decide to give him, make sure you include some kind of note with your name on it. You wouldn't want to give him a gift and make him guess where it's coming from. The note with your gift doesn't have to be highly detailed. It can be as simple as To Jack, From Jill. The gift is what you're explaining yourself with, so the note accompanying it can be very low-key.
Be honest with what you want. Structure your note like a poem. Use quotes. Compliment him. Add an inside joke. Include a personal gift.