1) You can't create a new character unless your present one dies. After this occurs, you must wait three weeks to create a new character (this was done to help discourage suicide). As for the speed skill, don't waste your time with that. Most of your time will be spent on a starship.
2) You can't create a new account or delete your present one. See above.
3) Yes, your chracter continues to travel to where ever you set it to head to. Once it reaches the destination it stops.