I have found the following Guide to be useful in searching for my Arkansas ancestors.
Ancestry.com has a new state guide, “Arkansas
Research Guide: Family History Sources in the Natural State.” The new state guide has an overview and timeline of Arkansas, along with resources to explore when searching for your Arkansas ancestors
Check out the guides for other states available in Ancestry's Learning Center under
Free State Research
Guides. They are adding new research guided all the time.
Happy ancestor hunting.