When starting a new project you have to create a new project, not simply a new source file.
To create a new project, click command New project from Project menu. You will see the dialog window:
When creating a new project, please specify the following data:
After you specified project settings, click OK. This will create a new empty project. On the left side of the window you will see empty Workspace View. If the Workspace View is not open, select View and checkmark Project workspace to open the Workspace View.
After you have created an empty workspace, you have to add source files to it. Next chapter describes how you can do it.