What happens is the existing coulombic E lines rearrange themselves to oppose an applied field (by moving the charge) and for motion not due to an external field the lines rearrange to give an net E vector opposite the motion.
In any case, I don't see where you're trying to go with any of this, or how it ties in to gravitational waves.
Instead of trying to puzzle out basic E&M from the top of your head, I suggest you start with a good undergraduate textbook such as Electricity and Magnetism by Edward Purcell or Electromagnetism: Principles and Applications by Lorrain and Corson, and study it. There's far more in either of those books than I could ever type in for you on FR.