To write a privacy policy, there is not certain length if must be, there are no regulated topics you must cover unless your site falls under one of the above regulations. A privacy policy should be short, simple and concise as to not over load the user. Use care to include topics the consumer may be interested in such as your reasons for collecting the information, what information will be collected, security around the information and how you will use the information, how to change their information and contact information to the editor or webmaster of the website.
After you have written your privacy policy you need to place it somewhere visible on your website. The best method is to create a whole page dedicated to the privacy policy or dedicated to all the policies related to you website. Link this page to your index or home page on your website. Name the link something very simple like “privacy policy” and put it in a visible spot at the top of bottom of the page.