dude if i was u i would just get real fucked up an start making out wit her an shit then slowly work ur way then once u know it u will be pounding the shit outta that pussy an she will have ur v-card for the rest of ur life so make sure u dont fuck it up. good luck mane
You should let her know you're a virgin, definately don't tell her you aren't.
Foreplay is your key here cause the sex won't last that long.
im a virgin and i recently had the chance and i wasn't erallly nervous. haha don't over think it i guess