As to jerk, it is recommended to move the jig freely at a slow speed during falling without line tension, rather than high speed short pitch jerk, so that the jig makes long slide, flapping.
As to how to manipulate rod, cast it lightly and once it hit the bottom, make slow retrieve while flipping up the tip 30cm. The knack is to create line slack intentionally and give a jig time-lag to make slide action. This method is especially effective for Yellowtail. By jerking up after slide, the jig starts to dart and run thanks to the knife edge on the back.
In case you want to fall the jig to your desired depth, do not make line tension free, or you are likely to have line trouble with other jigs, affected by wind and tidal current. Instead, it is recommended to fall a jig by holding the line a little while giving tension, and you will not miss even an unexpected bite during falling.