After you download and install it, you can only import 1000 hands unless you buy it. After you buy it, you might have to wait a day for the reg code.
I found this series of articles helpful in learning how to use it. They are geared toward no-limit play, but are worth reading even if you only play limit.
http://www.bet-the-pot.com/index.php?mod..._position=26:26
This is as far as I have gone. If you have some links for the ton of good advice you have found, I'd like to check them out.
I haven't played on WPEX, so I can't help you there.