Simplest way is to set up an XMarker Heading wherever you want the Player to start. Double-click it, and give it a unique ID. Go to Quests--CharacterGen/CharGen (forget which, sorry) and look under Stage 5-- there should be a line reading "Player.MoveTo CGStartMarker"-- simply change "CGStartMarker" for your XMarker ID.
This will stop the MQ, however, but dependin what you're trying to accomplish, that may not be a problem.