Hi,
I agree with Tishie. Since they're all over th place at this age, it's also good to baby proof your house to avoid him get himself in the tough situations to begin with. Even though he's not talking much, he probably understands alot more than you think. So try to explain things to him after you've told him a firm NO. Also try to keep him busy and happy(with snacks/naps). If kids aren't getting enough good attention, then they'll look for any bad attention.
Try not to give into spanking at all, because I don't believe they learn anything but fear from that. Get some good books on positive parenting. I remember that age very well when my 2 girls were young - they really keep you on your toes. Best of luck with your little guy.