Yes ur status wil be non resident if ur stay in a tax year in U.A.E is more than 182 days,now coming to procedure u have to apply online filling ur particulars at e.fbr.gov.pk than submit it after that with in 72 hours u wil recieve ur nation tax number,but to get ur ntn certificat u have to submit few things like ur online aplication ,cnic,employment certificate,bank account operation certificate or bank statement,online ntn verification statement, at Ntn cell at Rto and with in hour or so u wil get ur ntn certificate.