procedure for entering qatar w/ work or visit visa

  i was offered a job there in qatar.im here now in ksa and would like to go there from here.what would i need to present to immigration upon entering qatar?i resigned already and my visa here was cancelled already.my employer there told me this a.m. that my visa is ready and they are waiting for me there.i have no knowledge yet of what kind of visa they issued,we have to talk again later.do i need a copy of my  visa upon entering qatar?for enquiry only for my knowledge on what to do.thanx a lot.