How to send signals?!!

Ok so I like this boy and all my friends are telling me to go for it, especially at the next party. I really wanna get off with this boy at the party but the problem is I'm kind of a slow burner and I don't want to be! I'm kinda shy and awkward with this stuff bc I've never done it before, but I don't want it to be like that anymore. So my question is how do I send signals/flirt and build up to the kiss at this party?!!