Welcome to 5 Star, Grzesiek.
The place for you to start around here would be the Newbie Affiliate Forum and read as much as you can there. Pay particular attention to the "Sticky" threads.
After you gain a little more knowledge there you could spend some time reading in the Niche Marketing Forum
http://affiliate-marketing-forums.5s...che-marketing/
Again pay attention to the "Sticky" threads. However there is a lot more useful information in the threads that aren't sticky.
Our members are helpful and very friendly. Ask questions whenever you have any.