Sooner or later you'll find that you can't figure out all the things you want to know about your BlackBerry on your own. Well, at least not in a timely fashion. I also figured out that my carrier's (Rogers') tech support isn't half as knowledgeable as they claim to be. For this reason, I recommend finding a good online forum to learn the tricks of the trade (and to help others with your newfound knowledge).
The best I've found is CrackBerry.com. They have over 13,000 users and almost 2.5 million posts. The forums are cleverly divided into General discussion, Device-Specific discussion, Software discussion, a media corner (themes, wallpapers, ringtones, etc.) and even a spot for talking about North American carriers. Of course, there's also an area for social discussion, etc. but you'll probably never get that far :-)
Oh, and I should explain the name. CrackBerry.com termed so to reflect the actions of BlackBerry users. The argument is that a BlackBerry is as addictive as crack, and you'll never be able to give it up.... I'm not sure about that, but it's a great forum!