How to physically flirt with the guy I like?

I really like this guy and I crazy attracted to him but I don't really know how to physically take it to the next level. I think we're both a little afraid to touch each other too much because we're both a bit shy in that way. How can I subtly flirt with him physically without scaring him? I want him to know that I am interested because I am pretty sure he's into me too! Would appreciate any input! Thanks!!