Fresh content is the name of the game with social media. Be sure to have a strategy on how you will provide fresh content daily to your page.
Fresh content can be as simple as sharing content from another page, posting a link to relevant information from your website or responding to posts from others. Timing is very important. Your followers want to hear from you when news is happening, not after the event is over. Pay attention to what your followers are saying - this can give you ideas on what they are expecting to take away from your page.
Keep your content simple and link back to to your departmental or college website when possible. In fact, think of your post as a daily "elevator pitch," because that is about how long you have to engage and inspire your fans. If you don't provide engaging content, they won't come back.