Re: length for a leader?
As I have stated in previous post...I am a big fan of Furled leaders. Makes ME look like I can really fly fish! It does honestly!
With that in mind I use a 4-5 foot furled leader with anywhere from 4-6 feet of tippet. Early in the season when the Smalliesand panfish are hungry I use a shorter leader 3-4 ft and when they get spooky later in the season I up it to 4-6 ft.
I don't find any difference in catching fish with floro or mono. It might matter with trout, but I don't think it matters with Smallies or panfish. Mono is way cheaper than floro. I do tend to use floro when using sinking tip fly line. I believe it sinks, whereas mono is neutral buoyant.