Help a newbie out ;D

Hello!

I just joined WPF since I was interested in joining some puzzle competitions so I don't really have any idea on the etiquette, how to navigate the site, how to communicate with others, etc.

My main questions would be:
- Where can I see the schedule for the puzzle competitions?
- How do I get notified when they come up?
- How do I enter these competitions?
- Do I need to pay in order to enter? If so, where and how much?
- How do these competitions go?

Any information, as long as they are related to WPF and puzzles, would be helpful. Thanks!!!