Hi, is there a simple formula to calculate a pump size requirement?

well = 300ft - hang pump at 280 to 290

produces = 5 gpm

static = 100ft (immediately after driller pulled pipe out) now around 60ft using the pebble drop method.

well head to house = 80ft (level) into basement

2 story house - 2 people - 2 bath (20 ft lift or so from basement)

pressure = 60 psi

Pump recommendations? Where to buy on line?

Thanks.