2 questions

[Ryou]

Okay, I have two questions, first, I want to start skinning, so how do I unpack my files?
and second, I really seem like a noob asking it, but how do you build forts and watch towers?

(I swear, I finishd 5 campaighs and never built a single fort.)

[Marechal Ney]

Okay, I have two questions, first, I want to start skinning, so how do I unpack my files?
and second, I really seem like a noob asking it, but how do you build forts and watch towers?

(I swear, I finishd 5 campaighs and never built a single fort.)

I do light modding for NTW, so couldn't really tell you, but here is a guide: http://www.twcenter.net/forums/showthread.php?t=412456

For the second one, you need a family member (or general, just not a captain) in command of an army. Then click on the button (or hotkey) you would use to select building stuff in a settlement; instead, if the army is out of a town, you can build forts. If it is out of a town AND in your territory, you can build watchtowers. Forts cost 500, watchtowers 300 (or maybe 200...)

[painter]

While forts can be useful, you may also live without them. But watchtowers are clearly more useful if you don't use the toggle_fow cheat.

[Ishan]

I want to start skinning, so how do I unpack my files?

Check for skinning tutorials in TWC university and the tutorials sections in graphics workshop.
As for unpacking the game read this tutorial.