I know that in order to become a bishop, a priest has to go through a consecration ceremony, but I also want to know
How does a priest (who is to become a bishop) get selected?
Do they have to undergo any extra training before consecration?
Is there an age requirement on how old you have to be in order to become a bishop??
Do you have to have served as a priest for a certain period of time before being consecrated a bishop?