Fly Fishing Basics (Line, leader, backing and tippet rigging)

This combo I bought has a leader included, how do I find out what

leader line for trout fishing,cheap - OFF 59%

Rigging For Fly Fishing - The Missoulian Angler Fly Shop

Fly Fishing Rigging for Steelhead & Salmon - Current Works

The Gear You Need To Swing For Great Lakes Steelhead - JS-Outdoors

How to Setup a Fly Fishing Rod and Reel: From Reel to Fly - Guide

What is a Tippet in Fly Fishing? [Complete Guide]

Connecting Loops in Fly Fishing Lines

How to Setup a Fly Fishing Rod and Reel: From Reel to Fly - Guide

Fly Fishing 101–The Basics

7 Easy Steps to Set Up a Fly Rod