Once you are done with the installation, let's start some more serious stuff.

Starting a new project

To create a brand new project, select File > New from the menu bar. This will open the new project creation window:

Enter the name of your projec and its location in the two text fields. Select then the type of project you want to create:
  Empty Project will create an empty project with no source file.
  Symbian Stationnery Wizard is slightly more interesting and will allow you to create a project starting from a predefined model.

Select the Symbian Stationnery Wizard to enter the SDK selection window:

You can notice that several SDKs can cohabitate smoothly when you use Codewarrior. You don't need to use the device command or extra tools like EnvSwitch to have everything configured properly.

Select your SDK and you will be prompted for the type of project you want to create:

Each stationnery is an application model. By default, The Nokia Series 60 SDK v1.2 for Codewarrior installs three different stationneries:
  HelloWorldPlus is the Nokia Hello World Plus example
  New_Project is a Series 60 application that does nothing
  Untitled is a basic project with a single empty CPP file

The UIQ v2.1 SDK has only two choices:
  HelloWorld
  Simple Application is a basic UIQ application that does nothing.

Once you have made your choice, Codewarrior will create the project for you and you will be able to edit it.

Importing an existing project

Another way to start new stuff is by importing an existing project (ex: one of the SDK examples or a project made using another IDE). To do this, select File > Import Project from .mmp file....

You will be prompted to select the SDK to use with this project (same window as above). And then select the MMP file of the project to import:

It is a pity that Codewarrior uses MMP files instead of BLD.INF file to do the import. If you have a project that contains several components (MMP files) gathered by a single BLD.INF, you will not be able to import it in one shot. You will need to create as many projects as components.