Job Hunting

Hi Bhavna,
Thank you for welcoming me aboard, hope I will make it in Doha. Concerning the thread "work in Doha" I've read that already, however, the other topic was new to me, thank you.
What I am interested in, is some insights from you guys who have been there for a while and knows the job hunting process.
Is it hard or is it easy to find and secure a job?
Are the Sales &Marketing jobs in demand these days or are in downward trend.
For my  education( Chemical Engineer with an MBA)&experience(15+) what is the salary bracket to expect, if getting an interview and hopefully securing a job.
How long does it take to get a job there, assuming everything goes nice and smoothly, from the moment you have your first interview to signing your contract?.

I'm asking these question, because I'm still in Romania and I will only stay there 1 month, and being honest I very much would like to line some 1st interviews up, in other words to hit the Qatar ground running!
Thank you again for your welcome Bhavna!