Well technically speaking a converted model to serve as a lord or sorceror in power armour and a 10 csm box(new box) will start you of. This as a group of traitors is 5 or more members. Granted this is the absolute minimum, but it is a start from which you can build as you'll most likely end up with at least to groups of normal csm.
well because I'm starting fresh too, I'll be starting with 2 boxes of Chaos marines, and the Lord, then I'll add on as I go along, just start with the very basics, if you want bezerkers in your force the the battleforce is a nice starting point
You could probably mix and match the parts with the Berskers and the CSMs in the battleforce to make 3 squads of CSMs if you thought creativily and didn't mind doing some chopping. Thats if you didn't want a squad of berserkers but still want to save money and are thinking of the Battle Force.
To me, the Black Legion are the Ultramarines of evil. They are basic yet offer a ton of customizing that the dedicated legions can't, and of course adding the others into the fold. Hell yes to your choice.
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