ctd. -
Finish by saying that you want to treat him like an adult, which is what he is rapidly becoming, and will be pleased if he accepts what you expect in your home, as you would from anyone, including each other as parents. If he continues to behave like a child, point out that this is his choice, and his childish behaviour begets appropriate sanctions - early bed, not TV, no going out - punishments to be ratcheted up until he comes to accept that the choice is his - maturity of discomfort.
When he does behave - and sooner or later he will, emphasise how much happier you are living as adults together. Most children have a character that responds to praise - it's human nature.
Be patient, be firm, be consistent. Don't row, don't yell, but apply your punishments fairly and completely.
A child who does not learn appropriate behaviour in the home is unlikely to learn it in the wide world, where people are far less tolerant and forgiving. Act now, and prepare your son for the world outside his secure home environment, with the tools to make his way easier, not harder.