As Mike said, you have to use the front battery, as it has ground common with the truck ground. Since it has its own alternator, there's no worry about running it down compared to the other. Just make sure it's a good battery.
The only holes that will be there already are the ones in the front of the frame horns, though you'll probably have to loose the shackle brackets to make it all fit. The hole or two above the axle for the kicker braces must be drilled. Be careful not to drill through the brake lines, as they're right behind the frame in that area.
Check all the bolts frequently if you do much plowing... I always had trouble with the kicker bolts coming loose until I added some 3/4" spacers and longer bolts, like the steering box has.
Have fun, plowing snow is theraputic!
C