I would like to add an advertising banner to the bottom of my app. I don't know where to get started with this on the apple site. I'm not currently trying to advertise my apps. I'm trying to make this question as simple as possible so I can get the right answer.

I'm interested in making a turn based board game port. What are the best tutorials on implementing turn based Game Center matches? Does apple store the turn / game state on their servers? No cost for the developer or the users?

What is a good video to look at regarding detection of objects? I'd also like a good video for detecting the state of a board game. For example, if all the pieces on the board are in a particular state, what would be a favorable next move for the AI? Or at the very least, can we detect how well a certain players position is in the game?