I am thinking of starting one with a friend. To begin with, certainly, we are only thinking of covering our costs to see if it works. My friend and I both have 12 year old girls and they and lots of their friends have expressed an interest. I am a pretty good home cook (although certainly no Masterchef) and we were thinking of covering things like basic pasta dishes (including maybe making pasta which is fun and easy), cottage pie, casseroles; puddings, soups, desserts like crumbles, cakes, pavlovas etc
So .... I have a few questions please for anyone who has run something similar or whose kids go to a cookery class. How many kids do you think would work at a time in an average sized kitchen and separate dining room/working area? We thought 6-8? Do you have dishes which you think should be included? How long do you think each session should last? We thought of 2 hours. Is it a really daft idea? 
I have done similar things with Scouts before and I am a teacher so am used to working with kids. Any advice/ideas/recommendations?
TIA 