Follow manufacturer's directions for testing the detector. Install detectors on every level of your home and outside each sleeping area. With bedroom doors closed, adding a detector in each bedroom will provide extra protection. Make sure detectors are placed either on the ceiling or 6-12 inches below the ceiling on the wall. Purchase a smoke detector if you do not have one.
Smoke detectors are inexpensive and are required by law in many localities.
Check local codes and regulations before you buy your smoke detector. Some codes require specific types of detectors. They provide an early warning which is critical because the longer the delay, the deadlier the consequences. Read the manufacturers instructions that come with the detector for advice on the best place to install it. Install one detector on each level of the house, and one outside the sleeping areas.