[cammoammo]

You should never use pre-made models for this stuff, for copyright issues and compatibility.

Modeling a missile is quite and easy task once you get used to modeling, and I recommend you to learn the basic tools of Gmax before advancing.
Modding itself is pretty hard to learn in one day, it takes a lot of time, trial and error to get things going.

How did the v-1 become flyable?