How to become really good in poker?

[kensher]

Hello! I'm a 18 years old and I want to become really good in poker and make it profitable. I go on high school in Norway and thanks to dusins of oil and socialism I get a schoolarship of approximately 200 bucks per month. I want to invest 50 or more of them in poker. I play on Pokerstars and I have lost and won maybe hands. I have played cash games for over 1 year now.

I'm also gonna buy a poker book: "Secrets of Professional Poker by Rolf Slotboom"

Can someone experienced tell me how I can become really good and make it as profitable as possible? I want to play poker instead of working.

I also have to ask, about online poker and head's up, I feel that it's is difficult to play after player's patherns and mathematic online, because you can't read their body language etc. like it's live.

- kensher