Getting into Haxe and Air can be tough since all the content is on a myriad of different websites. Here is a nice little list of useful websites that will help along the way. It is by no means complete and only aims to give the most important links.
Adobe Air
Air SDK Download
Air SDK Beta Download
Starling (Fast Render Library) Forums
Air Development Forums
Air Bugs and Performance Issue Forums
Action Script 3 Forums in Animate CC
Air Beta Forums
Facebook Action Script Group
Facebook Stage3D Group
Haxe