I would say the weedy grass could possibly be tall fescue--it looks like it is in clumps. Except for the thistle on the left of the last photo. I would not worry about the dormant Bermuda. It will likely come on strong when the temp hits about 85.
You need a local experienced small company to treat the weedy grass. I can't advise you on that. Besides its hard for me to understand...you want to kill everything green so everything is a uniform brown--is that right?