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This sounds like very typical 19 month behavior. They are trying to learn their boundaries and explore their world. I would suggest you learn as much as you can about dealing with toddlers. There is a lot of information on the internet about age appropriate behaivor and how to deal with it. It is really important for you to decide your boundaires in regards XXXXX XXXXX you will accept from him and what you won't and then decide the punishment which sound like your best choice is the time outs (but they are only to be as long as the age so about 1 1/2 minutes for him). If his behaivor continues even after you set boundaries for him then talk to his pediatrician who can guide you in the right direction.