Mr. Skullium

Scarcely Lethal Noob
I understand most of the steps shown in this video
youtube.com/watch?v=Wqv0Hiil0_A
But can someone help me on how to have custom models for the bosses (example: shrek or vader) and weapons (like ass pancake's hammer).
Also, can anyone help me on how to set up a private server for myself to test out any bosses I made?
If so, thanks.
(Despite me having more than 2 posts, I cannot post links yet)