Giving my boyfriend a hand job?

well tonight my boyfriend is coming over and we were talking on the phone and i told him i would go far. So tonight he is expecting a hand job, and i have no clue what to do like at all. they say you need an lubricant? well i don't have that! im 15 almost 16 and i am kinda a good girl and now that good girl thing is so messed up! my boyfriend is 17. im just scared and cant back out now. This is my first time even like touching a . and i don't know all the big words for the whole hand job. So if you dumb it down that would be great!