I recommend that players interested in becoming students of the game go learn/digest the rules themselves, primarily by actually playing a pin, or playing with someone else who knows the pin.
But if you just have to know in advance, in addition to rule sheets, pintips.net, and Pinside and Tiltforums searches....
- video tutorials
- gameplay video
- competition video
- Instruction cards on IPDB
- Manuals on IPDB
Or even better: ask a friend or other people online. It's fun to talk about pinball.