First time eh?
For your first time, it aint all that bad. The concept of the story is good, and the animation is not all that relativly bad. It's pretty smooth compared to what I've seen other people do for the first time.
It's cool that you have music, but it doesnt fit in with the story at all. When you see people shooting at dragons, you expect somthing a little more hardcore. You should also work on perspective of your drawings, and get to know them a little bit more when animating.
Since it's your first time, (plus I don't have anything up on newgrounds to top this.) I'm giving you a six for effort.