1.Not sure, I don't have experience with 3d world studio, but try takng the texture file (an image) and using the TEXTURE OBJECT command =/
2.What I would do is something like this:
set object position camera position x(),camera position y(),camera position z()
set object rotation camera rotation x(),camera rotation y(),camera rotation z()
And the pistol object should have an offset center so it appears on the right/left of the screen. this stuff might not work, I'm currently a noob as well.
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(¸.•´ (¸.Eviljackson1