Well more on that some other time. Right now , lets go over some factual information about what content you should use. First of all, you should have your own database of pictures. Preferably updated often. Also, downloadable movie clips.
Members love that.
Video feeds are very much in demand. Whats important when it comes to content, is your exact calculation of how much you pay for content and how many sign ups are you averaging a day. So, one of the solutions is to start we pre-bought content and minimal feeds, and as you are finding out your sign up ration and best traffic, start easy increasing your content to keep those members that signed up for your site.