Guild Wars 2

Hi.
I think I screwed up. I thought it would be good to move/tranfer one character to a medium server for a change and to go to when the main world is too crowded.

When I did the transfer I thought it was only the selected character.
Does it move them all?
Can I go back?

thanks

Sorry if such a noobie question but…….
searching did not reveal an answer.

Do I have to hit the F2 key or does the pet do it as an attack rotation?

thank you.