I'm probably going to get ripped for this reply, but since it's a rather slow day, I'll respond:

Normally, the two ways I've rigged jigs are:

Dink float on mainline. Mainline to either in-line slinkey or hunk-o pencil lead on swivel. About a 2-3 foot leader with jig on the end. Move dink float up and down line as necessary. The fish will rise for the jig. Use a heavier/ligher jig depending on water conditions.

The other way is to use something on the lines of a Thill Float and a jig directly on your mainline. No other weight needed. Move float to depth as needed. Again, use properly weighted jig for water conditions. I'm too cheap to use the Thill Floats, so I opt for the cheap dink floats and option #1.

The only time I've used split shot is when I've floated bait or plastic worms. More often then not, I'll just shorten up the leader a bit and not use any split shot. If the water is dirty, the fish don't seem to mind the in-line slinky or pencil lead within a couple of feet from the bait. Kind of a booneyfloat method of using bait.