I've yet to see a better video explaining how a mechanical watch works than this one produced by Hamilton more than 50 years ago:
Next, the guys at Hodinkee have an awesome Watch101 section that gives illustrations, definitions, and explanations for lots of technical terms and complications. this is a fantastic resource not to be missed. Click here for Hodinkee Watch101
If you still can't figure something out, contact us. We'll try to point you in the right direction and add the answer onto this page.