As a newb, I would recommend mechanical and light cosmetic restorations (replacing broken plastics).
Unless you have experience from other parts of your life, DO NOT attempt playfield art restoration and clear coating. While you might have great success, you might also have a great failure, which would immediately devalue the game. I would rather own a game with playfield wear, than a game with bad touch ups and a horrible clear coat job.
Just my 2 cents.
Best regards,
Tom