Thanks for the FAQ questions.
The server selector on the left only shows the servers you have added. Currently you can only add 2 servers because there is only 2 servers in existence. You cannot create a server. A server can only be created by an admin or automatically when a populated server becomes 50% full. Servers currently allow a maximum of a 1000 managers.
Yes your credits replenish when you:
1. Win a challenge that you have made. Not when someone challenges you.
2. When you win a title bout with more than 10 players in the federation.
3. When you win a special event with a credit payout. ie: 10 man Battle Royal.
4. The easiest way post media actions (Trash Talk/Sneak Attacks/Interviews). You will be awarded the credits after the show has been completed.
And if thats too slow for you, you can purchase credits when that feature is available.
Hope that helps.