ASP.NET MVC3 Mini Forum Help?

Just recently took the plunge in web programming and starting with MVC. Just wondering on architectural advice. What would work best in your opinions, creating a model for each: Category, Forum, ParentThread, ChildThread and creating a reference list in each model for the child? (Parent and ChildThread could inherit from a Thread Model) That is the first way that comes to my mind so I doubt it is the correct way. Any advice?

Thanks guys.

I don't think the design would be discussed with such a small and confusing data. However,I don't think your inheritance idea is rightly applicable for models. Can you explain further if you have plans to use Entity framework etc. ?