From my experiance fella, you need to decide what you like to photograph first.
I started photography in Dec 2006, and bought myself a 400D, jumping in at the deep end. I'd never even held a DSLR, and only really looked into them about 3 weeks before I bought mine.
I rushed, as you do being young (I was almost 17), I had money burning a hole my pocket and I saw the Canon 75-300mm telephoto lens, I had a quick look on a few sites and it seemed alright, so I bought it. £170 lighter, I now had a big, long lens in my bag.
In the time i've owned that lens, i've used it 6 times fella.
Now that I understand photography, and the ins/outs of it, I should'nt have bought that lens, I should have spent it on something else ie. a flash, a different lens etc.
If you KNOW what you want to take photos of, by all means fella, knock yourself out. But with me, I love shooting cars, but I've also come to like shooting landscapes & portrait too, but for the stuff I shoot, the 75-300 is far too long, get what i'm saying?
So just have a think on what you'd like to shoot, and see if it will REALLY suit your needs, and what else could replace it for the same kinda money that would help you/suit your shooting better.
Hope this helps dude.