Buy the "eau de parfum" variety of a perfume, they have a higher percent of aromatic compounds in it. They often come in smaller containers becuase they're so intense and you only need to dab on a little bit. When you put the perfume on, put it on your pulse points (wrist, inner elbow behind your ears). These places are warm because you've got lots of veins around there and when the perfume is warmed, it rises and you smell lovely!
Make sure you put your perfume on before your jewellery as well as the metal will react with the perfume and change it's smell.
Also, you could layer your products. I love D&G Light Blue and I have the bath wash, moisturizer and perfume so it gets 'layered' on me when I use all three products.
Buy the handbag sized perfumes to carry round in your bag on a night out. Make sure you spritz lots on before you go out and then just top up with the handbag sized one as necessary.
What i do is after taking a shower i spray perfume on my neck, the more the better. Never spray perfume when ur not fresh and clean. After that i spray perfume on my clothes. This is how it stays for the entire day. It doesnt matter what perfume your using but i highly recommend Lancome's PEUT-ETRE. Im always asked what perfume i have on.