Answer:
Well what works for me is when you have something in common with them like your on a team with them or in the same class make a way to sit beside them and make it look like you did it by accident or that there was no other option, and then just say hey I'm so and so or whats up or what u been up too? those are some good conversation starters but you might have to be really nice and patient with a shy guy and he might be really stressed so take it easy on him and be patient:)