Welcome. My first advice would be to spend as much time as you can at the counters smelling stuff. Try to pick up the basic differences between Fresh, Oriental, and Spicy scents. Take notes onwhat you like - either in the store or at home. Pester them for as many samples as they can give. Don't worry too much about learning specific notes yet, just get a handle on what you gravitate toward. Many folks new to the hobby tend to start with the fresher fragrances - these are the Aqua and Citrus blends. They tend to very safe and inoffensive. The problem, however is finding a fragrance, fresh or otherwise, that suits you and your personality. The sales folks may push you toward something hyperpopular like Aqua de Gio - a nice fragrance, but it has become so overplayed that it really says little about your personality as an individual. So take some time, read the reviews here, and take it all with a grain of salt. Take time to find something that really gets under your skin, something that you fall in love with.
What stores are you near? Where do you do most of your shopping? Let us know so we can advise on what might be available.
That being said, I will recommend a few interesting ones to try next time you are out. These all should be readily available.
John Varvatos - A modern take on dark leather, and a great fall/winter scent.
Issey Mayake - Try his whole line for nice, fresher scents with some character.
Kenzo - Try whatever is available by this house. Interesting, unique, sometimes challenging.
And I will second the recommendation that you try L'Instant Pour Homme by Guerlain.
Good Luck. And let us know what you find.