The weekly events list of events being held is here :-
Tennis Tipping Managers Thread 2013
As you're a new player - you will find it easier to gain entry into a Challenger although of course the choice is yours, the Challengers threads are here :-
Just pick the event you want to play in and say 'IN' in the thread, which is your committment to play. The front page of each event has the info of the deadline time, how to send picks, etc.
If you have any queries the Manager of the event will answer any queries you have - or any of the Board (myself, Marto, keqtqiadv or Boarder35m) will happily answer any other queries you may have - any queries are generally asked in the 'Ask The Board' thread here, :-
Ask the board Thread
Good luck and hope you enjoy the game.