Hi, Mabrook and welcome to Doha, Qatar.

I'm new to Qatar, just three months completed and working with a govt. firm. I could bring my family soon after my RP (less than a month) and had no need for bank statement etc.(only passport copies, photographs, and marriage certificate for wife & birth certificate for children).

I don't know if it is diffrent procedure for private companies and Govt.
Wish you good luck and success