I'm glad it worked for you.
Its very simple, its just a short script and a quest to run that script once.
The instructions in my first post pretty much tell you what to do but here's another brief example.
First make a new quest in the GECK, call it whatever you like but I'd go with something like AmmoActivateQuest
Tick the start game enabled box, this is very important and i forgot it when i first wrote this. XD
Tick the default script processing delay box and set the priority to 60 or something like that, then click ok.
Next up is the script, make a new one.
Here's a template script you can use.
Exit the script and hit save.
So after you've done that, go to the quest and select the script you just made from the drop down menu named script.
Save the mod and you're done.
I hope that was clear enough but I'm not very good at explaining things so if you need any help just let me know.
Take care and have fun.