Ok first...the AC thing is probably your final stage resistor. a cheap and easy fix. you can even do it yourself. there is an article on this site to walk you thru it. Next, your ABs, DSC, brake light thing is most likely a bad sensor. Probably the steering angle sensor. Again relatively inexpensive, maybe 300 - 400 bucks including labor. Third all the other lights on could be a bad ignition switch which throws everything off. Take it to a good indie shop that regularly works on BMW's and German cars.. you'll have the best luck there..GL