Before getting focused on creating applications, I think it's wise to present the official source for information, support, downloads, and forums for BlackBerry—the BlackBerry Developer Zone at http://www.blackberrydeveloper.com. Here you can find the official documentation, a knowledge base full of great articles, support forums, and much more. Specifically, here are some great resources to go for more information in the future:
BlackBerry developer documentation: The official source for documentation—http://na.blackberry.com/eng/support/docs/developers/?userType=21.
Tool and SDK downloads: The place to start getting the tools needed to develop applications—http://na.blackberry.com/eng/developers/resources/devtools.jsp.
Developer knowledge base: An impressive collection of articles addressing specific issues, problems and situations—http://www.blackberry.com/knowledgecenterpublic/livelink.exe/fetch/2000/348583/customview.html?func=ll&objId=348583...