Well done mate. Your definately advancing in leaps and bounds.
The Dark Ale is my flavourite kit also. I personally have now done away with the BE's and am up to the liquid/dry malt only stage, but don't be afraid of adding hops (just because I am). I believe that you have a greater selection to choose from if you use liquid malts, Light, Amber, Dark and Wheat. All of which of coasre add different characteristics to your brew of choice.
11 Days in the FV is fine, 2 weeks is a nice round number and allows you to start and finish on weekends if you are time poor during the week.
Regarding the brown sugar, adding a little bit at the start won't hurt with a dark ale, will add a small addition to the flavour, but I've never used it for carbonation.
Welcome and good luck.