You need to see a doctor to get a prescription for birth control pills. There's a small range that are most often prescribed to start, which most women will tolerate well, and he/she will try you on one of those to see how you get on with them.
How the pills work is by keep your body from ovulating -- i.E. Producing eggs. They do this by fooling your body into thinking it is already pregnant, using a synthetic version of a particular hormone. When women are pregnant, they stop producing more eggs.
Taking the pills is easy: you take 21 pills, at about the same time every day. Then you either take the placebo pill, or none at at, for 7 days, during which time you would have a period -- this is not a real period, since you didn't ovulate, and is usually lighter than when you are not on the pill.
Note: would it be possible for you to write your posts in english instead of mobile-phone text mode? It is very hard to read.