What are the basic steps should I follow to make a photo realistic avatar?

Can you help me find the right step by step process of rendering a photo realistic avatar in web?

Requirements:

1. I need a avatar for Men's tailor made suit that renders photo realistic fabric.

2. I need the avatar to move in circular motion seamlessly.

3. I need the avatar to be use in web browser or to be render in web.

4. How can I make it an API based?

Was it easier if I just could make this an app? or my browser need to download any plugin to render it smoothly?

Thanks in advance.