Some why I decided to learn ANN and GN but I discovered fast that they are useless in games. I'm not sure if games is what I want to do, but for now I have a lot of free time and since I tried my self as a graphics developer, now I want to try myself as AI developer. I will be happy to get any help regarding where and how to start with AI in games! Thanks a lot!

I would recommend either of the two books I link to in :
Game AI for begginers .