Hi,
yes, i will post a guide for it in the next few days. But until that i will give you a short explanation:
You have to create an app at https://developers.facebook.com/apps/
Go to the advanced settings of your app and connect your page with it (App Page Setting).
That's all. You can debug whether your page can access relevant data or not at https://developers.facebook.com/tools/explorer/:
Choose <appID>|<appSecret> as token (do not forget the pipe sign)
Choose <yourPageName>/posts as Request. You should see your page's posts.