you may find these helpful. annnd PM - checklist sent Enjoy your new obsession, you are in the right place!
https://pinside.com/pinball/forum/topic/em-pinball-circuits-basics-to-not-so-basic
http://www.pinrepair.com/em/index.htm
https://pinside.com/pinball/forum/topic/how-to-efficiently-ask-for-pinball-repair-help-em