He is going to think everything is a chew toy right now. If you want to potty train him, put the 'pee pad' in one spot(where he is peeing.) Do not put them all over the house you will be giving him the wrong message. Use some kind of reward every time he uses his pad to go potty and once he associates his little pee pad as a place to go potty he should stop ripping it up.
Be patient, very patient he doesn't know any better right now! :)