When I start to using Unity, I was scrolling down to they "Prefab" projects, such as 3rd Person, car movement, etc. But, I realized that the 3rd Person camera had a strange feature: it doesn't looks like the commom game gameplay, it's bizarre and unnatural. So i decide to make this model to be based on: a better 3rd person camera to substitute the old one from Unity.
It's a simple system thus it helps to start since you can spend the time to develop other features in your project.
Get it full here -> https://github.com/brenocogu/3rdPersonCamera