4: How would I make said 2D background 'animate' like how FD's background or Battlefields BG.
FD's background is not 2D, I think.
Yeah, It's very 3D.
Animating a 2D image - well, you can't just import an animated GIF.
You need to use a lot of 2D models in the same place, each with a different texture (1 for each frame of the animation) and use VIS0 animations (well, that's the easiest way) to make only 1 appear at a time.