heres a few tips on float fishing
Set the Depth of Your Float – You want your hook to travel approximately one foot or more off of the bottom. If the water you are fishing is four feet deep, set your float 3 feet above your hook. Remember, fish cannot see down as well as they can see up, so you want your offering to drift above the fish. They will rise to grab your hook, even during cold water conditions. As you begin to fish the run if you notice that your float is catching/jerking backward, your hook is probably hitting bottom so you will want to shorten the float’s position. Similarly, if you make several passes along a run and don’t catch a fish, try going a little deeper.
Keeping a close eye on your float will tell you a lot about the position of your hook. It should always precede your float down river. The ideal situation is to have your float standing straight up and down or slightly tilting up stream. If the top of your float is leaning down river, this means that your hook is dragging behind and to correct this situation you'll need to reel in your slack and pull back on the float.
If your float is tiling back a lot, your hook is probably traveling too high off the bottom. Try a heavier lead.
just some tips i read