On 17.12. the Doha TT thread will be open.
If you want to play, you should post there that you would like to play.
If your rank is good enough, you'll be on entry list.
The manager (thread starter) does the draw. You get your opponent in the draw. Manager posts OOP for every day. And you are predicting winners of all posted matches in OOP. Example:
Davydenko-Robredo SR1 PTS
You send the names of players who you think will win to manager via PM.
SR means you predict the winner in correct sets.
Federer def. Gonzalez 2-1
When it says SR1 PTS
you should predict the correct SCORE.
Davydenko def. Robredo 7-6, 3-6, 6-1
Seems like you don't have ranking yet, so it will be hard for you to play on the ATP tourneys in the beginning. You can play challengers.
This was short explanation, if anything is unclear, ask.