Girlfriend and I using vibrator for first time, help?

It all depends on what kind of stimulation she wants. If she's never used one before, a clit vibe would be the best, as opposed to a g-spot vibe.

It really depends on what you are looking to do. I love using eggs/bullets on my clit while hubby is inside me. You can have her hold it. Also, my hubby loves to tease me, he'll have me lay on my back with my legs spread and then he'll run an egg all over my body on my nipples and legs and tummy etc.. He'll keep sweeping it over my clit/pussy and it makes me go crazy. Then when he finally digs in and puts it on my clit I have an explosive orgasm. Make sure you get in on the right spot and hold pressure, don't move it around a lot. Hope this helps, and good luck!

Because it is her first time using the vibe—you should let her drive, so to speak, while she gets to know what she likes. She may not like the strength or type of buzz of a particular vibe (but don't give up, there are many different kinds of vibes out there, so experiment if the one you've got doesn't work for her), she may need more or less pressure, speed or other adjustments as she uses it. She won't know her needs until she gets a little practice and then she'll be the very best expert to give you advice on how to please her.

Enjoy!

I would have to agree with Laurel in letting her drive to start out, especially if it's the first go round. I would also recommend you take careful watch and pay attention to her reactions both verbally and physically, and not just on her face. Breathing pattern, muscle flexes, and even the sounds of the toy itself with give you cues as to what she is getting out of it. These will be important when she throws you the keys. When it is time to take the wheel, or at least the stick, you will be ahead of the curve. Then it is ultra important to follow her instructions. Remember it is all about her. That said, I have found sometimes imposing a little bit of your will can help her to find something she hadn't tried, either by mechanical impossibility (fancy words for "I can't reach that from here") or just hadn't thought to try. Communication and attention as always the most important things in any encounter, along with having fun and enjoying the whole event.

Well got it in the mail and we used it the first chance we had and she seemed to love it. I went with the advice of "letting her drive" for the most part. Appreciate everything from you guys because it certainly helped!