where do I go from here? please help

Hi! I just started learning blender recently. The essential blender book is the only tutorial I read so far. I only know a few basic tools like extrude, merge and loop cuts. My goal is to make presentable low poly (poly count about 2000 ish?) game models.

I want to make better models, but I don’t know where to start… modeling tutorials are all over the net but they all seem confusing for my level.

More specifically, I want to learn some general principles or basic setups behind 3d modeling so that I can create models out of my own concept arts etc.

Anyways, this is what I can do right now:
http://img243.imageshack.us/img243/9348/lowpolymalere3.png
http://img243.imageshack.us/img243/9348/lowpolymalere3.536f8954a5.jpg

Thank you for your time.