Level 10 - 11 is fine but with one proviso. If you have imported a character from SoD don't head off to Whin Hill really, really early like I did. My first try was just after doing the slavers in the slums, and the Copper Coronet - I wanted to pick up the cleric theif early so he'd get all the XP. Wkat I actually needed to do was collect the sort of kit the group would have collected after starting at the old level and working your way up tp 10 - 11 (decent armour, some +3 weapons etc)