My best advice is to start here:
http://www.ethanwiner.com/acoustics.html
> I've read about green glue which sounds great but I also read too much wall mass in small rooms (is my room small?) can be detrimental by reflecting excessive bass energy. Can someone offer advice and explanation on how I should proceed? <
First you need to decide which matters more - sound getting in and out of the room (isolation), or the quality of the sound inside the room. These are competing goals. You can have both! But it's much more expensive. If you're not worried about disturbing anyone else, or being disturbed while listening, then we can proceed directly to treating the room's acoustics for good sound.
--Ethan