1. No, once you have at least one character that has been on server B you can add as many more as you want to either server A or server B (assuming you made a character on server A and keeping in mind the 15 character limit).

2. Yes, you just have to type the name of the sever into the server option box during character creation or else it defaults to either the last server played on, or the last server you created a character on.

3. It's there for good, characters are tied to the servers the were created on. There are currently no methods known for transferring characters, such as EQ's pay $50 to lose all your gear and switch servers.

Leighton