Thinking about pitching a senko and have a few questions.  Spinning or baitcaster?  What kind of hook to use?  Swivel or no swivel?

Either will work, I'd lean towards the baitcaster because I can flip and pitch more accurately and can use heavier line with it.  No swivel.  Hook depends... if you are rigging weedless, use 2/0 - 5/0 worm hook ; depending on size of bait, desired sink rate and size of fish in the area.  If you are pitching it wacky style, probably go with a smaller, straight shank hook.

if you look at a couple threads above this one (Got a question about SENKOS?) you will find everything you need to know about senkos

go with the baitcaster, use a swivel only if you are having trouble with weight.  as for the hook, use a 1/0 wide gap gamakatsu finnese hook for the wacky rigging.  its enough to hook the fish, but it doesnt get cuaght up in weeds