well im also 16, and am now involved in a serious relationship. i no how u feel, its like u dunt no how. but honestly, just do what feels natural. if hes making the first move its not hard. perse ur lips a lil and suck gently on his top lip for the first kiss. buh dunt worry, if u both like eachother, u cud do crap and u both wud stil b xcited. buh it wont b, just do wats natural and for a first kiss, it shud b fast and a blur, probably best at da end of ur date as well.