Install Fallout 4 and the Fallout 4 Creation Kit from Steam
Install a mod manager such as Mod Organizer 2 or Vortex
Launch the Creation Kit and load the Fallout 4 master files
Create a new plugin file for your mod
Set up the mod’s name, author, and required files
Edit or create items, weapons, armor, quests, NPCs, or locations in the Creation Kit
Save your changes frequently
Test the mod in-game after each major change
Use Papyrus scripts if your mod needs custom behavior
Create or edit meshes, textures, and sounds with external tools if needed
Package the mod files into the correct folder structure
Add a plugin file and any loose assets to the mod package
Enable the mod in your mod manager
Load the game and verify the mod works correctly
Fix conflicts, bugs, and load order issues as needed
Upload the finished mod to a mod site if you want to share it