I'd say first things first get some transports. Most Dark Eldar lists, unless you're doing something super specific like Coven or Wych Cults (and usually even if you're doing that) use lots of infantry-filled gunboats. It's probably the best thing we have going for our army now. You've got two HQ choices, you've got 3 troop choices if you want to use your Trueborn as Kabalites, so I'd say get a Raider and a Venom. Put 10 guys in the Raider with the Archon, and 5 in the Venom. I think that's a pretty decent list to start off with.