Igniters are used to safely start the rocket engine burning. NEVER use a fuse and a match; always use an igniter that is controlled electronically. That way you can quickly abort the launch before a mishap occurs. Apogee Components has available a wide selection of igniters that will work with different types of rocket engines.
Wadding is used to protect the plastic or cloth parachute from the burning particles that are thrown forward when the ejection charge within the rocket motor is ignited. It keeps the chute from melting or getting tiny holes singed into the canopy.