Be calm!
It is always full because the ram disk is not of a specified size - it will dynamically grow as you store things on it. It is finite though, there is danger of filling all the ram you have if you don't pay attention to how much you're storing on the ram drive.
We don't mind all the questions, so long as you don't let the uniqueness of the Amiga become a reason to get fed up with it and abandon it. Anything worth having is worth pursuing.