Store startposition in a variable

How do i store the start position of an object in a variable so that it can respawn at a certain point in the game??

Assuming you're using javascript, first make a global variable like:

var respawnLocation:Vector3;

then on the start of the game, just store the character's position (this assumes the script is attached to the object):

function Start() { respawnLocation = gameObject.transform.position; }

and now just use that respawnLocation variable when you want to go back to that location.