I think with disapear you mean that a model fades away in a animation?

I dont have done much with poser animations so I leave that question open for the animation guru's.

For a gun flash, you can use a prop.
I think this will work in animations to, just experiment with size etc.
Smoke should work to.

As example you can find a muzle flash prop here.
Download the prop and pick it apart to see how they did it.
This should give enough information to create your own flash/smoke prop.
Or just use it as it is.

I hope this helped a bit.

I am not a complete idiot, some parts are missing :)

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