From the MATLAB main window, click on the New button and select the Simulink Model option.
A blank Simulink window will appear, showing an empty model named untitled. This window is made up of the following sections:
The title bar with the name of the opened system (untitled).
The menu bar immediately below the title bar.
The toolbar below the menu bar with the default tools (the Library Browser and Model Explorer are the tools most used).
The Model Browser panel on the left displaying the model's hierarchical tree (it can be hidden with the « button at the bottom right of this panel).
The model editor panel on the right of the Model Browser panel is the most useful panel. If you like a clutter-free edit window, you can hide all the other panels through the View menu (I suggest that you leave the status bar though).
The status bar on the bottom reporting the name and the current status of the underlying simulation solver (more on this later).