Although you are not strictly a beginner I advise you to read this tut/article that might help you make your mind.
To answer quickly your first question C2 isn't up to the functionality of Classic yet in the matter that it isn't as eye-candy, and less plugins/behaviors are available right now.
But you have to consider also C2 as a different tool than CC.
If you are aiming at a "tiny" browser game, C2 is already up for the task and might surprise you.
Just download the free version, check the "example" folder and browse the forum too.
There have been already many C2 examples/wips posted and you can already make full apps with it.