Yes, bracing will need to added to a garage door that has never had a garage door opener attached to it.
The reason the bracing is needed is because the garage door opener pulls back from the center of the door and it will cause some flexing in the top section of the door.
Over time this can damage the door if it is not properly braced.
If you need assistance with your garage door in the Cincinnati area, call Cincinnati Door & Opener at (513) 821-5095.