The Android platform is available on an array of devices. Due to this, setup will vary based upon the device you own. General settings are below, if you need further assistance you can get specific instructions for your phone model from your carrier.
Exchange is the preferred setup. Due to some security settings, it may be required that you setup a screen lock on the device (Settings --> Location & Security --> Set up screen lock). The Exchange setup may also be listed as Corporate Sync.
Email: your OU email address
Exchange Server: exchange.ou.edu
Username: your OUNetID (4x4)
Password: your OUNetID password
Description: OU Email (can say anything)
IMAP setup can be attempted if Exchange setup fails.