Do I Need a Sinking Fly Line?

A sink-tip fly line is really only needed if you very frequently fish "down deep" and find that weights on the leader either don't provide the depth needed or bring it down deep quickly enough. Again, for trout fishing, stick with a weight-forward floating line. It will likely be the only fly line you'll ever need.

Do I want floating or sinking fly line?

Floating or sinking lines

If you are fly fishing for trout in the river then a floating line is all you will need. If you are fishing on lakes and reservoirs then you may need to invest in some sinking lines too. A sinking line enables you to get your wet fly down to deeper depths than the floating line will allow.

What sinking line should I use?

The long sinking heads are preferred over full sink lines because the running lines float and are easier to manage for repetitive casting. Full sinking lines are crucial for effectively fishing a lake. They keep the fly 'fishing' in the feeding zone for a longer distance than a sink tip lines or full floating line.