For this one, using the Desert Sand, I lowered the Blackness (B) of the ground to 30 and I set the Width to 25x and Bump to 2. I made the sky pink for you
Make sure that each emitters are grouped and the texture applied to the group not the faces and that the front face is facing in the direction of the flow.
The missile's emitter is fine, but it looks like the front face of the ship exhausts are facing to the front not the back. You can select the Back face as the face to emit light for a quick fix.