A.R.
From a mother of 3, none of whom responded to the word no until much later than 12 mos... You just need plain old persistence. There really is no true "discipline" that works at this age besides redirect and repeat. I know it is tiresome, but one day he will be old enough for consequences and it will get more manageable. Until then, do what you need to to make his environment as safe as possible. Try a pack and play for when you absolutely can't take it any more. He may realize that he doesn't get attention when he doesn't listen. Good Luck!