Good idea to start early. I've added a couple of links that are helpful. I always did research on where my son attended. Make sure there weren't any complaints filed with DHS and also followed the star system. OSU/OKC child development center was absolutely wonderful for my son. We still go back and visit the staff.
Another avenue you may want to pursue is if you will still be in your neighborhood and what elementary school they will attend. Lots of daycares work with the schools in providing before and after care and provide transportation. If you can get your child started in with a daycare that would be doing that for you, you would be more comfortable when the time came for your child to be transported by the daycare staff.
Oklahoma Department of Human Services - Oklahoma Child Care Locator
Oklahoma Child Care