Every fan page is around a subject. Some are more specific than others but still there is always content you should post and content you shouldn't. Learn it as fast as you can and stick to right content for your fans.
2. Interact with your fans.
This is extremely important. Interact with your fans in any way possible. Always include questions or call to actions in your post. Always think of a way to make your fans like/comment/share your posts. If someone doesn't interact with your page for a while he/she stops seeing updates from it in their news feeds! This is why many admins see their "people saw this post" drop every time they update their page. Those people don't interact with the page so they stop seeing anything from it. Respond to all messages sent to your page inbox too.
3. Don't post too often.
If you post every one-two hours, you are slowly killing your page. Posting every hour used to work for making most money but Facebook changed everything once again and now we have to adjust our strategy. Post no more often than every 3-4 hours.