D, Here is how I learned from a few lads to work these properly
Toss er out, this is a weightless bait so spinning gear is more affective.Toss er out into open water, on a weedline, into pockets of slop, lillies, and so on.
Let it fall till you think you have hit bottom, give your rod a "Twitch" Like working a topwater, but only once and let it fall back to bottom.You can do this all the way back to the boat, but if there is an active fish he will take it right away.
"Fan cast" (Cast many times and cover water for aggresive fish) and try to locate them.This is why we twitch once maybe twice, because the bigger fish will hit on the fall, or when it rests on bottom(Personal Exp, others might have had other techs aswell)
A senko(Or senko typed bait) is a great bait when fish are lethargic, say after a cold front, or heavily preasured waters.
A circle hook is a rounded hook designed to rotate as a fish moves with the bait to roll and then expose the point or barb have you, and tension locks the hook into the fishes mouth b4 it has a chance to take the bait all the way down in the gullet.
Hook size depends on you or the size of the "Senko, or typed bait" you throw a 2/0 to a 3/0 is a rounded choice for many.A bigger hook will also avoid deep hookings on fish, though too big and well you are asking for a non hook-up.
The bleeding hooks as of late(Bait colour pending) have been good.(The red hooks) Though if you are using a black, or dark type bait make sure to have bronze, nickel, and red hooks, because the hook is exposed, might make a fish think twice in clear water, or preasured cons.
Hope this helps a bit more.
F.F