At this point you've made it through the initial setup of Eclipse and are looking at the workbench, which is where you do the majority of the real work. When you start Eclipse again in the future, the workbench is the screen that should be shown automatically, along with any projects that you have made. At this point, you don't have any projects open, so let's solve that particular problem right now!
The BlackBerry SDK comes with several good example projects, including the standard "hello world!" application that we all know and love. Because this simple project already exists, you're just going to use it instead of creating one from scratch. These sample projects aren't in the Eclipse native format so you have to import them in by using an Import wizard.