I am wondering how to get a designer for the mxml where i could drag
and drop lists, buttong and build a UI in flex.
The current version of Flash Builder has one, and I thought that was the only Flex IDE that had a design view. The Flash Builder design view is limited, as it only works with the current version of the Flex SDK and is all around problematic. Most developer's don't ues it and the feature will be removed in the next version of Flash Builder.
I've heard rumors that IntelliJ may add one in a future version, but I wouldn't count on it.
Once i have that, if I build that as an application, it seems to
generate a swf file. Not sure if i can run this in anything other than
a brower. The latest adobe flash player has not standalone exe.
Correct; a Flex project's primary intent is to build an SWf file that will run in the browser. At one time Adobe offered a stand alone player that the SWF would run it. I'm not sure if they still do. It was not practical to assume end users had the stand alone version of the Flash Player, though.
I have no idea if FDT supports this; but you can use the same, or similar, code with Adobe AIR to create an AIR file. The AIR file should run anywhere that the AIR runtime can be installed. If you use the Adobe AIR Captive Runtime feature on a windows PC you can create an executable.