Setup the game and play it. Enjoy it. These things are meant to be in a commercial environment taking abuse from kids. They come with everything you need to play it right out of the box.
The only thing I would really recommend to change before playing is the trough eject power. Reduce it as low as it will go and still reliably eject the ball. For me on all my machines that is the lowest setting.
When I start seeing dirt lines I wipe the playfield with novus 1. That's a monthly cleaning. Every 6 months or so I check the balls for damage and clean with novus and wax the playfield.
Don't over think it. Play it and have fun. You won't hurt it.