Ido58 when you re-spec you go back to level one and re-do everything except for race and such.
For a mage dip Wizard is probably better as it lets you learn every spell in the game while level one Sorcerer gets you a few level one spells.
I'd suggest getting bard to 6 or ranger to 5 for extra attack ASAP. Heck since you are level seven I'd re-spec to Bard 6/Ranger 1 or Bard 2/Ranger 5 right now to get extra attack.