I've been searching for more informations about normal maps in the last days, but I'm still not really sure what I can do about the seams. It seems to me that normal maps will always have visible seams and therefore I have to hide these as good as I can. Or it could be a shader problem. Normal maps begin to drive me crazy. *grablagralagraagh*
I think I'll leave the NM as it is now, because the seams are only visible if you zoom in very close.
The model is rigged already, but not yet animated. I'm also not sure how the model should be scaled and what animations are needed. Wasn't there a list somewhere?