There are several ways to rig a tube, my personal preference is with 1/4 to 3/8 jig head. First I dip the head in smelly jelly or other attractant, this helps with the insertion, then I slide the head into the tube till the eye pokes out the top end of the tube, leaving the hook coming out the bottom.
You can also rig with head outside the tube, running the tube up the hook. There are other ways, but those are the easiest to get started with.
Another fun way to fish for smallies is with Senkos. Wacky style is very easy, just tie on a 2/0 or 3/0 hook, then fold the senko in half to find the center point and the run the hook thru the center, then cast and let settle to the bottom. Jiggle the rod a litte and then let settle again, this can be very effective.