Just want to know how long it has to be to target saltwater inshore gamefish i.e. redfish trout thanks

About 3 feet. Depends on how you are planning on fishing though. Give us some more info. Popping cork? Carolina rigged live bait? Artificials?

Artificial

3 feet is typical if you tie your lure directly to the fluorocarbon, it allows you to do multiple reties before putting a new leader.

18"-24" if you use a swivel on the end of the leader.

Is it better to tie a line to line or use a swivel going from braid to flouro? What size flouro is ideal for wade fishing for reds n specks?

My fluorocarbon leader is made using 2 piece of fluorocarbon,one tie to the braid,and between this 2 piece of fluorocarbon i use one swivel.Total length of my leader is about 4-5 feet.
For catching specks and red fish i use 12-14 lb. fluorocarbon leader.

Good luck!!!

I usually use 20 lb fluoro. I tie it onto my braid with a uni to uni connection

X2 no swivels or snaps. Stealth catches more fish.

I usually tie direct flouro to braid with a surgeon's knot. I may use 2-3' or 6-7' depending on water clarity.

I will sometimes use a swivel if I feel like I'm getting line twist from a particular bait I'm using.

Braid to 24" of fluoro south Alberto's knot.
I use 10lb braid, 20lb fluoro for artificials.

I use invisaswivels...stealth!

I start with about 5' and that gives me a couple feet to retie. Never less than 2-3'.