How do you makeout with a boy?

Ugh okay so i like this boy and he knows how to makeout and we always kiss and stuff but we never made out because im scared i would make a fool of my self...What are you suppose to do when making out? If he puts his tounge in my mouth what am i suppose to do with my tounge? Do i keep it in my mouth while his is in mine? Do i put it in his mouth? Or am i suppose to move it around or something..how do you get yourself to be a really nice kisser and what turns a guy on the most while making out? Also since it would be my first makeout does that mean i wont be as good at it ?