If you are asking about a Crosman Model 760, I suggest you go to the Crosman home page and click on "Download an Owners manual". Crosman still offers the manual on the rifle and not only will you see how to load it but you will also learn other features about the rifle.
Definetly the pump master. It is a multi pump gun so the fps depends on the number of pumps.
Crosman has all their Air gun manuals online see the link below and find your model. The list has both the Owners Manual and Parts Manual.
A Remington 760 Game Master chambered in 30-06.
PSI: It depends on how many times you pump the forearm. But Crosman says to never pump it more than 10 times. The 760 is rated at 625 FPS with a BB and 600 FPS with a pellet.
No
There are about 8 different versions of the Crosman 760. So I am going to assume that this is just a regular 760, not a Commemorative, 760B, 760AB or 760XL. In Good shape it is worth around $15
The 760 is not designed for rodent control. It was designed for simple back yard target shooting. You may be able to kill the snake but it most likely would take several shots.
You should really take an NRA safety course
There are 12 versions of the Crosman 760. Which one do you want.... See the link below
gun shop, gun show
If you do not know this or are unable to Google it or Youtube it and find out then I must question your competence in actually possessing a loaded gun.
The Crossman 760 Pumpmaster, It's Powerful, Safe and works like a real gun