I need a tutorial that explains the basics of Flash and AS3 (including usage of OO in AS3) Any recommendations?
There's some good stuff on this page...
http://www.moock.org/lectures/
Mostly lecture notes/slideshows, but if you already know programming you should be able to interpret it reasonably enough and supplement it with solid examples from other sources.
As @Jasconius mentioned Colin Moock's site has a bunch of really great information. His book (Essential Actionscript 3.0) is easily my number one reference source too.
Senocular has a series of really excellent tutorials on his site here: http://www.senocular.com/flash/tutorials/
Lastly, Adobe's documentation is pretty great and they also have a programming guide here: http://help.adobe.com/en_US/ActionScript/3.0_ProgrammingAS3/
Good luck!
If you're coming from C++ you'll be able to pick it up quickly. I hope this helps.
Learning ActionScript 3.0
Rich Shape with Zevan Rosser
“Good overview, explains displayObjects well”
Essential ActionScript 3.0
Collin Moock
“AS3 principals explained”
ActionScript 3.0 Cookbook
Joey Lott, Darron Schall, Keith Peters
“Every answer is here, and Keith Peters is an awesome technical writer”
Practical Examples
http://www.republicofcode.com/tutorials/flash/
ActionScript Community
http://wonderfl.net/