Before starting your journey, it's important to identify what you want to accomplish and who you want to reach. Here are some key things to keep in mind:
To explore this further, see the document from W. Ian. O'Byrne.
There are some excellent examples of others who are doing similar activities:
As you'll be a reflection of your university, one of the first things your should do is talk to your communications department. This area has their finger on the pulse of news and events for the institution and can be a great source of content as well as promotion. They can also assist you with your branding your web site.
Other places to look for ideas: