Perfumes can be concentrates perfume or Eau de toilette(diluted, cheaper, doesn't last as long as concentrate) )
The concentrates tend to be more expensive but the key there is to buy the perfumes as the drop off the top of the popularity. I started with David Beckham one for women called Intimately Beckham which they don't make any more and smells really good on me. I now have some Kelvin Kline Obsession which I got on a sale at out under 1/2 price...still high quality perfume...You have to try them on you skin, because they may smell differently from a card as they mix with your own natural scent and the oils from your skin.
You can dab the pulse points wrists, inside of elbow and knee's, neck, or as I watch my daughter do ...sprays a heap into the air and walk under it to let it settle on you...personally I use directly on the skin as some of it can stain. I have been know to lightly spray a scarf...but you need to be careful as too much can be offensive to some people especially in confined spaces.
I keep any empty perfume bottles(tops off) in the drawer with my underwear. Keep your perfumes out of direct sunlight whenever possible.