Techrepublic is a good place to start in the downloads area to get you started. There are some templates you could use to get you started on what to think about and consider.
I would also suggest something I have found very useful. Observe the current processes for each area that is needed for your organization to run smoothly. Keep in mind that your IT area is a part of the larger picture. So any policies and procedures you set should keep you aligned with the overall strategy and needs of the company.
Also, as you observe how things are currently working, ask questions about why something is done a certain way and how others might do it differently. Build "buy-in" with the community about the policy so that when it is done, they feel like they were a part of creating it and therefore should follow it.
The point is that before you can write anything, you need to gather as much knowledge as possible about the current state of things.