There is a ton of stuff already posted here on CiteHR on HR Policies. It is a question that is asked every week, sometimes more.
Please use the search facility at the top of the page next to the CiteHR logo to find all the previous discussions.
You may not find exactly what you are looking for, but you will find an abundance of material that you can adapt to meet the requirements of YOUR organisation. These are not one size fits all propositions. Every organisation is different and have a range of issues and requirements that need to be covered.