A some galaxy data needed

Hi I have a little problem
First of all I'm doing a little galaxy simulator. Of course I don't
try to simulate all 200 * 1000 * mil stars, but it's a reasonably
complex.
I would have a few questions
I was able to discover a rough numbers about various stellar
clases. For example O stars have densities A * 1/4000000. However I
wasn't able to find resource with more precise numbers. For example
how much more common are O8 stars than O7?
How many stars are in the bulge of this galaxy?
How many stars are in the halo?
Is there any statistic about stars in the bulge?
How much thick is the disk and bulge?

I also encountered a little problem. If I'd scale galaxy a little a
star would be more close to the bulge. This would mean a bigger
gama ray shower. BTW how intensive are they? And for how long they
would be dangerous?
The other alternative is increase distances by factor of 20, that's
bad too.