I really like him, how can i give him signals?

im not THAT hideous, i have blonde hair, a kinda long face, freckles, and green eyes. he's flirted with me before. we usually talk to eachother in lthe lunch line (im a softmore), he's also in my homeroom. he's really nice but i don't know how to tell him i like him without being straight forward about it. i don't know how to use " signals " either.