That is going to vary based on where you are and what mood the fish are in. You should be able to tell what depth they coming in at from your flasher or graph. If you dont have one you are in a tough spot and will need to rely on trial and error.

I usually jig with aggreesive motions until I see my first fish. I can tell on the flasher if it is coming straight in or with some vertical motion. If you are not drawing fish try higher. They feed upward. Next try a couple differnet lures. Repeat the process. If that doesnt work move.