Ciaran Laval has done such a good job of explaining how to get started in Sansar that I am simply going to point to his excellent tutorial. If you are confused about the differences between an avatar name and an avatar ID, or if you need any help getting your account set up, and taking your first tentative steps in Sansar, this is the first place you should go (aside from the official Sansar help, of course). Job well done, Ciaran!