Dinner and a show is sweet. That doesn't mean one time, either. The first time can be pretty good, but not as sweet as the fifth time, or the fiftieth. I can help get you started and I'll give you a few things to consider, but Brother, I can't do her for you. The following isn't intended to be a complete how-to guide to cunnilingus.
Good sex is experimental.
In my opinion, the mouth is merely the second most important sex organ. The most important sex organ is the brain. More than any of that, however, good sex requires a good attitude. Good sex of any kind is a matter of giving, not exchanging. So don't think that the reason you are going down on her is to get her excited enough to 'need' whatever you consider normal sex .