When setting up your snare drum, follow the instructions in the front of your book.
When setting up your xylophone, follow the instructions in the xylophone part of your book (towards the back).
Be mindful of how hard you strike the snare drum, to prevent the skin from being punctured.
Tune the snare drum with a tuning key every couple of weeks.
Replace drum sticks with worn-out heads.
Change broken snare wires.
Tighten hardware to fix buzzing (see above video).