Play Right hand on all crotchets (1/4 notes), and Right Left on all of the Quavers (8th Notes) – (opposite for left handers).
Young beginners players could count the crotchets as Tea, and the quavers as “Cof-fee”.
You might want to brush up the Reading Drum Notation sheet to help with reading this sheet.
Related (Premium): Beats and Fills Drum Book – Basic Beginners