You also need to debate if you want people staying at their desks. The advantage is that it means that they are concentrating more on the business at hand and being more productive, but it also encourages them to play games at their desk, especially if there are high walls. Also, by forcing them to get up every so often you keep your employees more mentally alert and encourage more employees to communicate with each other.
Obviously, you need to make sure that the chairs are comfortable enough to sit in for hours but not so comfortable that they fall asleep in them. Also, the desks need to large enough to store supplies but not large enough to block traffic. Finding the right furniture means your business will be a success so determine what you need and you will find a path to success.