Hello there!
It is possible to make game in Unity and put it in my page with ASP.NET MVC? Tutorials or something?
Are you asking about creating a game that plays locally and connects to an ASP.NET site to communicate with a server backend? Or are you asking if you can build a game and host the game itself in a website that supports ASP.NET?
I want build a game and have it on my website, like with flash player. Is it WebGl?
Yes, you want to publish it with webGL.