The only sources I can provide for what I am about to say is based on my years of reading, and what my memory allows me to remember, so treat what im saying accordingly.
Once a man becomes ordained, then he can not become married, regardless if he is Orthodox or Catholic.
It is also true that the RCC, by norm, will not ordain a married man to the priesthood, because that is their normal displince and happens virtually every time.
HOWEVER, if a man whom is married is converting from specific churches (Anglician/-related bodies, Lutherans i believe, and some others that hold an Episcopal structure of some sort(IM leaving out us Orthodox in this, because we are a special case) they CAN be ordained as married priests, though this is the exception,not the norm.
THe unsourced assumption that I shall make, because i believe it to be true from what I have read: A married priest will never be the pastor of a parish, because something makes him ineligible to do so. Assistant priest, yes, pastor, no.