Take your Rhythm Cards
Arrange them in any order
Clap and SAY the rhythm
Play and SAY the rhythm
When you hear a pattern that you like, write down your COMPOSITION on some music paper
Use a PENCIL that is not too SHARP
Keep your composition SIMPLE to start
use intervals of a 2nd or 3rds
Start from landmark notes
don't forget a KEY SIGNATURE if you need one
Can you add some left hand notes?
Can you add some DYNAMICS (louds or softs?)