Christ, you're 19 and new to drinking, no knowledge, not even basic knowledge on it?
Have you been living in a cave up until now?
Cheap and drunk fast, go to your shop, look for a cheap high percentage beer. Special brew, anything with "strong" or "extra strong" on the can.
Don't expect it to taste any good though.
Hate this "I just drink to get drunk thing" it's awfull boring, I drink for enjoyment, and if the mood strikes, to get drunk.
When I came new to drinking, I was about 13 at the time, before then I'd had the odd beer or wine with dinner on a weekend. But we used to buy 8 cans of fosters/ carling for about £6 in an off licence. I'm a freak of nature in that I was 6'3" when I was 13 and had a neck beard going, I could finish 8 cans, I'd be just about the right amount of drunk, wasted but not sickly. Used to be the event of a saturday, either find a party or sit in a field if it was sunny.
I'd say get 8 cans of skippy **** or carling, it won't tastes great but better than anything like special brew.