Try fun character toothbrushes and fruity flavored toothpaste. When he brushes you brush. He'll see what your doing and copy. Also try putting a small mirror at eye level so he can see exactly what hes doing.
My son is also 2, and I got him an electric toothbrush. It is a fire engine that has lights that light up, and he also had winnie the pooh tooth paste. These things really help with him wanting to brush his teeth. The electic tooth brush was only 3 or 4 dollars at Target.