There are 4 parts to your fly line! If you buy a kit, you won’t have to worry about the first 2! The backing is the very first part, it’s a thread like material, and then your fly line is next. this is the colored part you see. There are many types of fly line. But don’t worry about that right now. If you want to know more, you can read our blog post.
Here is the leader to buy (This is the piece that connects your fly line and your tippet): https://amzn.to/4cgEyiG
We actually make tippet, I reccomend buying 4x and 5x to start!
https://brookfishingco.com/collections/gear/products/brook-tippet