Not really sweetie, you most likely do it with your friends naturally and stuff when you're emphasising a point or are excited about something. It's just putting a little physical contact in to the relationship where none might have been before but it's not sitting on their lap or anything like that. Lots of eye contact. Wear something that looks nice but that you're comfortable in. Don't get completely blotto, you want to be able to remember what you're doing and be in control as well.
There's also something called mirroring, do you know how to do that?