You will simply start by downloading latest Frosty Tool Suite (Frosty Editor and Frosty Mod Manager) release from its github page: https://github.com/CadeEvs/FrostyToolsuite/releases

Battlefield 1 Mods page link: https://www.nexusmods.com/battlefield1/mods/

NOTE*
Your system may recognize both Frosty Tools as malware, so be sure to allow it to bypass restrictions so you can use it.

After you have downloaded Frosty and extracted both Editor and Mod Manager to your preferred location, you will obviously go to the Mod Manager folder to play with and experience game with mods.
When you open Frosty Mod Manager, you will select `Scan for games` so it searches and finds Battlefield 1, when its done you click on `Next`.
After that it will scan Battlefield 1 files and when its done, you will click on `Add Mod(s)`. Mod files are in `.fbmod` format.
After the mod has been added, then you will click on `Apply Mod(s)`.
You will then click on the `Launch` button.
Steam will ask you to `Launch the game with custom arguments`, just hit `Continue`.

NOTE*
I recommend you set the `Load Order:` to `Priority` instead of `List` if you ever decide to use a lot of mods. Also there is no need to change anything in launch options in Mod Manager since Steam configures everything itself.

ALSO DISABLE DX12 IN BF1 VIDEO SETTINGS, SO THE GAME DOESNT CRASH!

That`s all the work, enjoy your game lads!