Playgroups, Parks and walks!!!! That would be my advice. I have gotten all of my clients from word of mouth. Put yourself out there and talk to people! Lots of people.... and tell them about your wonderful daycare and how excited you are to be doing this. I got one client from a park, one from a sears parking lot, two from a playgroup and one from a mom already in my daycare.
Just start talking.........not being shy helped me a lot :-)