Johnny, A Point wilson Dart is about 4" long and I personally perfer the Sandlance or Candle fish type in the all white. You can get them at Outdoor Emporium, G.I.Joes, or Sportco. I try to fish them in 100'-180' of water and along drop offs. I try not to stay in one spot for too long (15-20 mins) for I find that if there are fish in the area, I'll get bit right away.
So don't hesitate to move around and try and locate some biters.The clay banks at Pt. Defiance is excellent jig water when the tide is not ripping too hard.
Try and fish with the lightest jig you can while keeping your line as vertical as possible. When you find that you're getting too much angle on your line, switch to a heavier jig. So I would suggest buying jigs in differant sizes.

I drop to the bottom and then reel up 3 turns and start jigging. I'll jig about 8 strokes and crank up another 3 turns and repeat step 1.
Continue till you're about half the way off bottom and repeat.

Good luck and I hope this helps you out.
Craig