Wait you can buy the complete set & use within your game? Wow. The level looks so polished already!
1300 Polygon as in triangle right? You should be able to get good details with around 5000 polygon(tris) with normal map applied.
My all time #1 tips for character modeling.
1) Go for proportion first (with minimum amount of polygon) ie. proper arm/leg ratio, proper spacing between eyes, proper size of head to body etc. (once your level of details become huge, it will be harder to refine the proportion again)
2) Go for shape i.e correct definition of legs, hand, fingers, eyes shape, mouth.
3) Then should you go for details, try to maximise the level of details in the lowest subdivsion possible, then subdivide, repeat these steps.
Anyway, going back to modeling task, making some mandane objects for used in the game, as warm up before getting back to making my one & only character in the game.
Took me a while to layout the keys on the laptop, but otherwise pretty straight forward modeling task. I will make the high polygon models for normal mapping when I am in the mood.