Had my BB for a couple of months and lots to learn! It got me out of trouble today tho I was hopelessly lost and then *lightbulb moment* Google maps!!! Got to meeting on time YAY FOR BB!!!
Check out the BlackBerry 101 How-To Lecture Series ! This will help you with the basics such as downloading apps, themes, wallpaper, ringtones. It's also a good idea to browse the forums and read as much as possible. Many questions you have are answered there already!