Your pump size and capacity will depend on a combination of the well depth and gallons per minute that the well produces. I have a 500' well that produces about 35 gpm. They put a 25 gpm pump at 400' in the hole. It is 5 horsepower and runs on 240 volts. My neigbor has the same depth well but his only produces about 7 gpm, and he only has a 1.5 HP pump.
My well was about $14,000 turnkey, including everything.