French Kissing! Helppp?

Okk my closee friendd is going to make out wit me soon hes done it a tonnnn and i have only had one shortttt kiss with a guy..im terribly nervvouss but i likee him alot and have to try it a first time once right? hes REAL experiencedd wit girls n stuff not x but as far as u can get wit out it..how should i approach it? and ALSO how long do u usually make out for with out it just getting boring and tiring ??