Water pump failed - got stranded

[Lacostas]

Hello folks,

So after few months that i was delaying the water pump replacement, i got stranded. Thankfully the pump went while i was 5 meters away from parking the car, so no overheating happened.

Warning light came on, i tried to refill with water initially, only to find out that the water was immediately getting drained under the car. Havent opened yet to check what damage has been done exactly, but have some stuff to ask.

Im thinking to DIY this job (already bought Pierburg) but im not sure what things i must check to be sure of any -side- damages cause of the pump "exploding".

Also, after i install new pump, what shall i pay attention to, regading the new coolant ill fill into ?

Some say that i must open the bleeder valve for releasing the coolant pressure ?!

Thanks!