There are many options to become a doula. You may wish to go with a certifying agency, or you may wish to train as an apprentice. Here are the most popular options

Study under Erin Aileen or another experienced doula and receive hands-on training. Some reading required. Cost: Varies.

Certify with the most recognized name in Doula  certification. Cost ~$550 + books

Doula Apprenticeship

DONA International Certification

Become a Doula

Here referred to as a Labor Assistant, ALACE also provides excellent preparation for work as a Birth Doula.  Cost: ~$475 + books

ALACE Labor Assistant Certification

Here is a complete list of available Birth Doula Certification programs and their features on Mothercare.ca.  It is the most comprehensive list available at this time.

Doula Training Comparison