Building Fitness Ning Page

I honestly don't know where to start, I know the basics though. What I really want is to create a membership site that is similiar to this one: [login to view URL] What I can't figure out honestly is how to use ning that much but I would want to add a blog and a video section which are payed for users to login to watch and read. That's basically it. I would worry about the color but I need the set up to be done and hopefully it's not hard to uplaod my blogs and videos. So yeah... I think it shouldn't be too hard to set up this type of site.