Cacio & calilove both already provided great insight & advice. I'd also say that the best thing you can do starting out is a lot of sampling. You can get them my asking at most places, or order them online or get them from some of the threads here on BN in the for sale section. Take your time & don't rush into any purchases (unless you really have the money to blow). Be sure to test frags out on your skin as much as possible. Many smell completely different on the strips vs. how they actually develop on your skin. Judge a frag in it's entirety as much as possibly. When I first started getting into it, I didn't look much past the opening of frags. If it smelled nice out of the bottle, I wanted it. I quickly found, however, that it's all about how the frag develops & dries down on my skin, & how much I enjoy that...because that's the part that lasts the longest. Also, some frags have very poor longevity, so by skin testing you can be sure to figure out if it's worth it to you.
I'd also add to give some frags a chance by wearing them more than once (if you have enough of a sample) if you're a little unsure of them at first. I don't do it with ones I absolutely can't stand at first testing, but ones that I'm not 100% sold on, but think have potential, I'll make sure to give a couple more full wearings. I've found some of my absolute favorite frags quickly or suddenly grew on me 2, 3 or 4 wearings in, but if I never gave them that chance, I wouldn't have known and would be missing out. Well, best of luck and welcome to this great site & community!