VEVOR Non-Barrier PEX Tubing 1 Inch X 300 Feet Tube Coil - EVOH PEX-B Pipe for Residential Commercial Radiant Floor Heating PEX Pipe

Yes, This should work well for your supply line from the well pump to your house.

Yes it definitely will. Be sure to protect the pipe with a sleeve or insulation when it's buried.

I would say that you would need more volume than just a three-quarter pipe