Parish councils have the power to publish a newsletter and so you need to consider who is writing the articles and who is editing. If your council allows for advertising, you will also need to work out the cost of that. Personally, my council doesn't allow companies to advertise in the parish newsletter, it keeps it cleaner. You also need to consider the printing costs and that is dependent on the number of pages, if they are in colour etc. Finally, distribution costs if you are using a specialist company. Some parishes have volunteers instead.