Welcome. You will find many resoures on here.
There are also a good chunk of other sites with great info. Check out this link for em pinballs. He is a member on here and his website has many great items (a section on bowler machines too!). This EM section has tons of good info that will help on cleaning up the mechanics of your machine as well; such as cleaning and adjusting switches, rebuilding/cleaning/adjusting score reels (some good videos too), etc.