This could be used for starting early vegetable transplants, overwintering houseplants, or simple uses. Before you make all of these choices, visit others who have greenhouses. The more sunlight you have, the more flexibility you have in what you can grow. But you will have to work on temperature controls, more. Even in the winter, greenhouses in full sun can get pretty warm.
Ventilation is a key component to greenhouse success.
In Arkansas, cooling a greenhouse will be more critical than heating a greenhouse. Automation is the way to go, unless you never plan to leave your greenhouse alone. Basic options in cooling are to either reduce the amount of light coming in during the summer or venting. Many greenhouses use both they have vents and they use a shade cloth for cover. Some newer operations actually allow for the sides to be raised for extra ventilation.