If you want to get started, you need the right truck.

The ideal plow truck is a Bronco, standard shift, at least a 351/300. Skip the 302. A working rear window that you can lower to see backing up. Studded snow tires kept at a low inflation. You want a plow frame that goes almost to the middle of the truck. Electric heated mirrors.

For large lots you basically plow forward in low, back up in high. Having a standard makes it much quicker.

Other then that, if you are pushing a lot of snow, then get a straight axle F-350 reg cab 8 foot bed, Load snow in the bed for plowing.

I think the best way to compete and make the most money is doing steep driveways in rich sections of the city. Get a Bronco II, automatic. It makes an excellent plow truck with the lighter plastic blades (basically steel frame with the board made of plastic). Plus, snow does not stick to it.

The F-350s and Bronco IIs I used never needed an extra battery, though I always made sure mine where good and they had A/C which meant they had 90+ amp alternators.