Full body collision

[Professorg]

I am fairly new to modding myself but I was wondering how I could go about finding

 

http://i.imgur.com/nA8Bykl.png

 

and about adding collision to things like forearms and weapons so that instead of the head of the bow/sword/whateverthefuckyouuse going threw the breast it actually collides with it.

 

thanks for any support!