Well I guess being 16 you will have a lot of time to practice, but seeing a movie and just deciding to give counting a try is well....
I know you can't see, for instance I am a percussionist/music theorist, I worked hard in my life in our college drumlines to be top tier and its pretty retarted when some kid comes along and says I saw that movie "drumline" (which I think is total crap) "and I think I would like to be a drummer now", just deciding on a whim to take up something that takes dedication and hard work, it kind of cheapens it ya know?
Its not all fun and games, its hard work, and the mostly likely outcome is that you will not profit from it at all.
You wont make money like in the movie. In real life the MIT kids made money sure, but thats because they had big bank rolls to play around with, because they had investors, BTW the movie doesn't tell that story you have to read about that, and the group "strategic investments".
If you have 200 grand lying around and you master basic strategy index plays card counting maybe some advanced tech, maybe you might find it profitable
BTW
High counts mean the big cards are left in the deck, still left to be played.
This is good for the player in many ways.
1. More blackjacks (and blackjacks pay 3:2)
2. Dealer busts more often (which I have read but apparently has been dissproven on this site

read around)
3. Better Double downs/payoffs
4. Adjusting your Basic strategy play based on the count (Index plays)
thats basically it, you have to read to understand at what point the count is actually to your advantage, dont just start counting and bet high when the counts positive....
sorry the answer wasn't "its easy and you can make millions with minimum practice"

good luck.