OrthoMan,
You can get into tying tub flies without buying a 'kit' or a 'holder' or any of that stuff if you just want to try it first.
As Dave mentioned, plastic Q-Tip shafts work great for the tubes. They use these typs of shafts on the 'cheapie' Q-Tip knock offs, and you can get several hundred of them at the dollar store in a variety of colors.
A piece of stainless steel wire (I use .040 welding wire, easy to get at any welders supply) will make a mount for the tube. Cut a piece about four inches long and bend a short (about 1/8 to 3/16 inch)90 degree angle in one end. Cut the plastic tube at an angle and slide the tube onto the wire until the angled cut engages the bend in the wire. This will keep the tube from rotating on the wire while you tie.
Place the wire horizontally into your regular vise, pushing the end of the plastic tube tight againse the vise jaws before tightening the vise.
You can now tie your fly on the tube. Trim the tube to length AFTER you tie the fly.
Many tube flies use a soft transition tube between the tube the fly is tied on and the hook. This lets you slide the hook eye into the soft tubing and thus holds the hook to the fly. You can buy latex or soft vinyl tubing for this at any aquarium shop and many hardware stores.
As far as actually fishing with the tube flies, I tried them and didn't like how they moved in the water. I do spend a lot of time messing with fly balance, attitude, and action, and they might work better on flies where this isn't an issue. On the plus side, being able to use varying hook sizes with any fly is a plus. And in some cases, where it's legal, having the hook hanging a bit behind the fly helps with hooking mortality when the fish are really eating the flies.
Certainly can't hurt to try them out and see if they work well for your fishing.
Good Luck,
Buddy
It Just Doesn't Matter....