How to Initiate Physical Affection as a Girl?

Okay so I recently started seeing a guy, I’m 21 and have never kissed anyone or yknow anything else and am very shy. The guy I’m seeing is a year younger and doesn’t have any experience himself from what I’ve heard and I’d like to try to be more physically affectionate with him (kissing and yknow) but I’m not quite sure how to go about it. He’s really fucking pretty and it makes me nervous but I also want to jump his bones. Help.