Jesus, Moe, I AM experienced, and I’m getting a hard on over that post! You’re giving away secrets! You’re gonna be a dangerous guy! ;);)
Honey, that’s true always, not just the first time.
And I think I love you.
I’ll give the same sex advice I give for anyone.
Have fun. This is not a serious deal, not at all. Don’t walk into it as a big world changing event. Don’t walk into it with plans at all, really. Just have fun and do what is fun. You’ll figure it out better if you keep the “lets have fun” goal in mind.
That said, clinically, experiment to find what you like. Every person, every couple, every time is different and should be fun. Not earth shattering nessisarily, but fun. Be sensitive to both your wants and those of your partner. Everyone should have fun.
Have fun and have fun and have some more fun. Do what feels like it could be fun. If it isn’t, stop and do something different.
My personal story? I lost my virginity more on accident. My ex and I were messing around (he didn’t want us to have sex, but we’d play and experiment.) and we slipped. The words out of my mouth were “What the hell is that?” (New sensations…) and we just started laughing and laughing. It was fun. No pressure and it didn’t hurt me a bit.
Since then I’ve been entertaining myself quite nicely, thank you.
Sex is supposed to be fun! True the first time isn’t going to be great, but you can still make it good. Try a couple different things, find out “how you like it”. If he does something that felt really good for you, tell him. Try to find out what he likes. Just remember to have fun
My best advice is foreplay foreplay foreplay…and then some more foreplay 
After awhile…you know when you are a total bundle of nerves…well the lubrication will take care of itself (hopefully).
My first time was like Medea’s…after the staff xmas party…just a little tipsy (very relaxed)…me and the ex fooling around…then OOPS! A buncha giggling and wiggling and stuff later we cuddled up to go to sleep…however a little pillow talk later we decided that it was necessaary to repeat…you know… to make sure I liked it
Me, I prefer my ex-SO’s first time. It lasted all of 2 seconds due to intense pain in her girlie bits.
Fortunately, that wasn’t with me. Furthermore, she never slept with the guy again.
Therefore, she considered me to be her first, and we had a lot of fun - “first time” fun, in a lot of ways - without any of the discomfort. In fact, all things considered, I think we were both very, very comfortable in that bed of hers. 
Note: Dr. Lao has found himself a comfortable spot on my Favorite Dopers List™ thanks to his insightful (teehee!) and kind words.
Just like to add…
Gotcha on that one, LaurAnge. -beams-