GetterTools is one of the most widely used external tools for Travian. It’s perfectly “legal”, and is a wonderful management tool.
Here is a very basic tutorial for players who never used it. In another post, I will tell you about advanced functions, like how to organize an attack.
Create an account
As a person, you have only one account, and you will use it for each server you play on. Creating an account is quite simple, the only advice I can give you : avoid to choose you in-game pseudo (because you can be on several server, and may be you do not want people of server A to know who you are on server B).