If it is a SHIT SHU(its a Shih tzu) then the potty is in the name only.. :D .. On a more serious note, i think the dog may be teething so please buy it a toy(bone) to chew on.. something of the softer variety since its stilll young.. And when he tries to bite people say no in a firm yet calm manner.
Regarding potty training, please take the dog to the bathroom after meals or drinking water etc since thats when he may feel the urge to defecate.. allow him to explore the area and his excreta. It will remember the spot slowly but surely. Whenever it goes potty somwhere else, just say NO! and clean the are immediately witha floor cleaner that helps with removing the aroma too... That way, it will not associate the wrong place as its "Potty spot".
Lastly its a puppy so please give it sometime.. and appreciate it after it finishes potty in the right place.. just pat it affectionately. All the best with your little puppy.