Thanks Vadim ^^
I solved that problem by my own now, but thanks anyway ^^.
I got some things to work now:
> Movement (WSAD + Mouse with camera handling for clamping the camera tilt)
> volumetric muzzle flash
> Shooting itself (and hitting someone until he dies )
> reloading (the revolver has got 6 bullets as cap | got infinit ammo so far ..)
> Animations on reload and shooting
> bullet counter that's shown on the screen (panel with digits)
> bullet hole's on walls, floor and ceiling.
> sounds (shooting and reloading)
Thanks to you guys I managed to do all this , so thank you again^^
next things I want to try:
> more weapons + changing them
> ammo pick up and "run out of ammo"-handling
> //some more things like game physics
I've got some questions and maybe you could help me with that too
1. Where can I get some free, animated arm models with weapons attached?
>like this one:

2. KI. How's the best way to code that someone's actually going to get after MY live?
>I thought about some thing with scan.. when I get in scan range of the enemy, it turns towards me, and fire's at me. but I don't even know how to start coding something like that =/
3. Is there a way to make that the View entity is affected by level lightning?
> the arm model is only affected by the lightning that flashes out, when I shot.
>>EDIT<<
One Thing I forgot !
The bullet holes are beeing aligned to the surface and all but theres one problem, somehow they begin to flicker when I move around, Is there a way to solve that?
>>EDIT END<<
If I get some other things I'll post them here too
thanks for your help so far just again

greetz Roxas~