There is no 'one-size-fits-all' concept for HR policies. As my learned professional friends mentioned above, you cannot just formulate policies as you wish and get them implemented. There are financial implications for many of the policies. Some policies may go against the culture prevalent in the location you are operating in. Each policy need to be designed, debated, discussed, get approved by Management, including the financial impact on the budget.
We are not here to discourage you but then informing you about the after-effects ! You are most welcome to go ahead, plan, design, but before implementiing take into effect the other aspects like financial impact on your revenue budget as well.
If need be, take the help of an external consultant, who will be impartial in his advice and service.
Best wishes