If you aren't already comfortable with repairing system 80 machines (and judging from your question, I'm assuming you are not), then this might not be a good choice. On top of the pinball portion of the game, there is a whole set of boards for the video portion of this game, and the monitor as well.
From your description, it sounds like the game has booted, is coined up, and is on the first ball. Whether or not a game can actually be played is another matter. If the ball display shows "11" instead of "1", then you will have some display troubleshooting to do.
There is not a lot of repair information available on this game, so you will be largely on your own if there are problems with it.