On the live expenses issue do a search since this topic has been frequently covered in the forums.

Also check the Qatar Guide

http://www.qatarliving.com/the-qatar-guide

Just scroll down a little bit and select the topic you want to read about.

On the dress code check this

http://www.qatarliving.com/search?cx=008937172676595728955%3A066rihafv68...

Also on living expenses, check here

http://www.qatarliving.com/search?cx=008937172676595728955%3A066rihafv68...

Hope this is helpful

Regards!!