Their life span is anywhere from 10-25 years, depending on factors such as diet and overall health. Cockatiels are relatively inexpensive. They are intelligent birds and easy to train. As with any bird, the key is consistency. Cages must be cleaned often and thoroughly.
Cockatiels come in a beautiful array of colors, or mutation.
Definately research the many possibilities before making your decision. As far as necessary supplies, these are some general, highly recommended suggestions. Within 72 hours of purchase, you'll need to take your little one for a 'well baby' check. This protects you and the breeder or pet store. Buy the largest cage you can afford.