Here's how you do the bubble thing.

Bubbleology 101:

Get any fillable bubble. The larger the bubble, the farther you can cast. Fill it 1/2 full, no more than 3/4. Take about 2 feet of heavy 15 - 20 lb line and tie a small swivel on one end. Take your bubble and slip it on the mono with the smaller center tube end towards the swivel and slide it all the way down to said swivel. Measure about 6 - 8" of your line and tie in another swivel on the other end in that spot. You should end up with a pre-tied bubble assembly. swivel -
bubble - swivel. About 6 - 8" long in total. Pre-ties are easy to store and manage. They are perfect if you want to switch between flies and a lure. Just cut off your main line at the leading swivel to fish lures. Re-tie at the swivel when you want to go back to flies. No need to remove the leader and fly at all.

Now tie onto your main 6 - 8 lb line. Tie it on so that the smaller bubble tube end is facing towards your rod (main line). You don't want it backwards or the center tube may push out from being reeled in. On the other end / swivel end, tie on your leader. 6 - 8' of 6 lb. Flouro for line shy fish. Now tie on your wet fly (wooly bugger, shiner pattern - whatever). Add a small split shot about 2 feet above your fly and you are good to go.

Now, cast out nice and slow and as FAR as you can. With 6 - 8' of leader below your bubble, make sure to lift the fly off the ground. Nice and slow smooth cast.

Once the bubble hits the water, do not do anything until the splash rings disappear. Just let is sit for 20 - 30 seconds. Now retrieve in slower than you have ever reeled before and then go even slower. Watch your bubble and if you begin to make a bubble wake, you are reeling much too fast. Don't try to strip, just reel super slow. If the bubble tracks in any direction that is not straight towards you, set the hook.

Grill trout.