Post template with predefined content

I suspect that there is likely a solution already defined for this problem, but my searching has not found it. I would like to create a post template with predefined content areas. Example: we have a monthly message from our organization president, it always has his photo and ends with his signature block. I would like to have a post template with those defined so it is simply a matter of adding the monthly content. Ideally I would also like to default the category and featured image.

Thanks in advance for any guidance