Hi there,
wud have been better if known ur background, in which speciality u were applying.Normally if are applying for a private sector u wud have to go thru the NHA examination, and apply to private hospital i here if ur a post graduate.
If ur fresh still to do ur post graduation, i suggest either u clear ur USMLE step 2 and apply for the residency prgram in HMC.(details in hmc website www.hmc.org.qa).Check the site out for the apllication dates.If not the other option is to repeat ur internship again here in qatar HMC and at the end of the year sit for the NBME exam held by medical education in qatar.
Based on the scores u will be short listed and can join the subspecilaty to qualify for ARAB BOARD SPECIALITY.
The post graduate residency program is for 4 yrs.

Hope it answers some of ur question
All the best.