I don't know if you are serious in your wish or its just a fancy dream.

What attractions did you see here in Qatar that made you wish to live in here and spend your time and money in playing poker and roaming around the plenty construction and road works in Doha?.

I hope the 6 shopping malls and cornich are so attractive to spend all days within.

You can come here for a short visit and see how is it here before you deside.

Bear in mind that there are no poker playing here or any of such casino's, otherwise your time will be spent within police stations.

Are you planning to stay without any source of income?
If you are that rich, why don't you plan to go to more fancy places such as Neice or Cann

Regarding citezenship, Just don't dream of it.