I have the regulator 7805 I need to know what color wires should be coming off the regulator

with the regulator on my desk with the leads pointing at me and I can read the 7805 do I put

the red wire on the left and black in the middle then the white on the right. I am also wanting

to know what gauge wire to use and how long to make them. I am installing a Z3 in my sport trac with stock sub and amp.

 

Thanks !!!!!!!