Install Fallout 4 and the Fallout 4 Creation Kit
Install a mod manager such as Mod Organizer 2 or Vortex
Install required tools such as FO4Edit, BA2 Archive2, and a mesh editor if needed
Set up a separate modding workspace and backup your game files
Launch the Creation Kit and load the Fallout 4 master files
Create a new plugin file
Add new records for weapons, armor, items, quests, NPCs, or locations
Edit existing records to change game behavior
Create or import meshes, textures, and sounds
Package assets into the correct folders and archive format
Assign scripts using Papyrus if scripting is needed
Compile scripts with the Papyrus compiler
Test the mod in-game
Check for missing references, conflicts, and load order issues
Fix bugs and repeat testing
Clean the plugin with FO4Edit if necessary
Build a proper folder structure for distribution
Create a readme and installation instructions
Package the mod as a ZIP or 7z file
Publish the mod to a mod hosting site if desired