Doula

Last year I attended a doula training workshop.  I figured I have had enough babies that I could help others have them too.  I have yet to attend a birth.  Granted I was pregnant for most of last year and then we lived in Modesto where I knew nobody.  But I really want to succeed at this.  I think I can do a good job.
So where do I start?  Right now I know 3 pregnant gals.  One is due any day now and doesn't want the use of a doula.  The next due is my cousin.  Around Christmas.  And her mom will overtake the whole process and I don't want to be involved.  The last friend due is a fellow surrogate.  She is due in January and is trying to VBAC so the last I've talked to her she said I was welcome to be her doula.
I don't have a name for my business.  Would I just make up card and pass them out?  I need a plan and I need to find pregnant people.  So now I need to think.