Here is what I use for my halides. I got this setup from JR in charllotte actually when he sold me a ballast setup a few years back.
You can go to Lowe's and buy a single cord and it will connect one ballast to one light bulb. It has three wires in it, connect your ground and power wires and you are set.
Basically what you do is go buy the cord, cut it in half or to whatever length you need. Wire up one side to your ballast. Wire the other section to your light bulb. Then you can plug them togther as seen above.