Design patterns for shape construction

I'm new to the design patterns and I need help to decide which patterns to use on my app.

The task is to write a simple console version of a drawing program, so if you insert:

C - Should create a new canvas of width w and height h

L - Should create a new line R - Should create a new rectangle Q - Should quit the program

So I have thought about using two design patterns. Abstract Factory for the commands and Decorator for the shapes. Is this the correct approach? or do you guys recommend using something else?