High Scores...

OK... I'd like to have high scores in my game but I have no idea where to get started...

I suppose what I need to know is...

1.) How do I store high scores so that even after the game is quit it'll still be there?

2.) How do I retrieve the high scores when the game loads?

3.) How can I store high scores online? (I think I'll have to buy a web domain or something to do this... I'll probably release the game without support for online high scores first and then if I make enough money from that I'll add it in a free update...)

4.) How can I retrieve the online high scores when the game loads?

... and how do I actually get high scores? I guess I want an array of high scores (which are themselves are arrays of NSStrings storing the name / score / date...)

I think if someone could provide some example code for a game with high scores that would be good...