A.C.
Good for you! You said you're moving to the Dallas area - I don't know about Dallas, only Plano/Frisco. There are lots of good church-based programs around Plano and I know a lot of people are happy with Spanish School House up in Frisco. Here's a great place to start: http://www.dallasprivateschools.com/
Just start calling and do your interviews over the phone. Sometimes you can get in on a waiting list around Christmas as families move out of the area. I only know of one preschool that charges for a spot on the wait list, so you can sign up with many! Good luck!