Wouldn't make a good teacher lol. Quite hard to explain, been looking for sites that might explain it better. Maybe the best thing I can suggest is you go to www.betfair.com. Wait for an inplay game, and if you can watch it on tv, watch the way the odds fluctuate depending on who's winning/losing. You can open an account without funding I believe, you can then put in amounts of money on the back and lay side and it will show you what you'd win/lose.
http://www.betfair.com/Index.do?pros...lse&origin=PHP
I'm off for some beers now, but will answer questions tomorrow.
Adster.