What's the best way to discipline my 7 yr old.. Wen his mommy's not around?? He's not a daddy's boy at all!

Adapt a combination of parenting styles (authoritarian, permissive, and the likes). This will be a trial-and-error system to help you guage which is best for your son. Definietly, being strict all the time and constantly using the rod will make them follow, but can do more harm than good... You will be feared by your boy.