You want to make sure that the legal terms of your website are clearly defined. Make sure it contains the types of personal information you want to share with the public. Be clear about what you want to give so that it is clear to everyone who visits your website.
Now you need to follow the guidelines for writing your policy. Make sure the guidelines are easy to read and not too long. Keep in mind that this policy will be your name for the site and you must be able to show the world how the site is doing.