I am using a doula. I got names from my OB. This helped narrow my search and know who has a relationship with the dr and has worked with them before. Also check out DONA online , they have a list. Where are you located and due, I'd be happy to send you the name of mine.
Look up Nova doulas I used Fern Compton for my dd, she was a lifesaver well, technically a naturalbirth saver as I'm not sure I could have done it without her! Highly recommend.
Re: doulas
I found mine there, after chats with several.