Therefore this is my main focus here, to help you understand some of the basic things you should have under your belt concerning using this programme in order to free the artist within you!
Start by opening 3D Studio max and set up the rifle image as the blue print. Go to Create>Geometry>Plane and drag the mouse on the left view port to draw the plane, in the Modify Tab use the Parameter panel to change the length and width to match the size of the image.