Almost all of it, yes.
yes
Remove the serpentine belt and the altenator. The water pump is behind the alternator. Make sure to drain the antifreeze.
your car will over heat and it will drain out the antifreeze (in your radiator). The water pump will drain fluid from the small hole in the water pump (hard to see) but if u look under and near the water pump you would see fluid. The water pump is normally found in the center of the serpentine belt on one of the pullies. Normally the cars serpentine belt will squeak from the antifreeze on the belt. if you are replacing the water pump you would need a water pump...a gasket for water pump and a new serpentine belt (dont buy a Napa belt)
The weep hole is "an indicator of bad bearings and/or seals" in the water pump when antifreeze starts to drip or run out of it. If antifreeze is coming out the weep hole, change the water pump.
Yes, antifreeze can leak from a water pump gasket.
Yes.
The water pump will pump coolant(antifreeze & water) through the engine after the thermostat opens up.
No
Drain the water from your cooling system. Remove the water pump return hose. Remove the water pump belt. Remove the water pump retaining bolts. Reverse the process to install the new water pump.
It is possible that the antifreeze is coming from a bad water pump. Clean the engine off. Watch it to see where the antifreeze is leaking from, as it could be a hose instead of the pump.
From The Information You Have Asked. You Have An Engine. There Is No Engine That I Know Of Where The Oil And Water Run Together. So The Answer Is NO. You May Want To Change Your oil After You Get The Engine Back Together And Running. But No You Do Not Need To Drain The Oil Out To Change The Water Pump.
Remove the serpentine belt. Drain the water from the radiator. Remove the radiator hose from the water pump. Remove the water pump retaining bolts. Reverse the process to install the new water pump.