Well I guess asking a few questions wont hurt. ^_^.
1. When you make a mod, do you get to pick where it is located at in Fallout?
2. How do you publish it to the web for other people to use?
3. Can you make armor, perks, weapons etc.?
1. It depends. Not all mods need a location. Take for example my Ammo Limit mod. That has no definite location. But for things like dungeons, yes.
2. You make a read-me, and you compress the read-me and the .esp together in an 7zip file. Then, add the file to The Nexus.
3. Yes you. You can make almost anything the devs made. Although you need other applications for making unique models for them.
Harmy52