Ok think I misread what you posted. Yes in theory children over the age of 10 don't count but then you run into an insurance issue because to them they do. Also children that age expect a very organized camp with outings, sports, swimming, etc. As well children that are 11-12 are old enough to be left at home so hard to get parents willing to pay enough to make it worth while.
The interpretation of the day nurseries act also says anything over 5 children needs to be licensed. I really think you are getting into dangerous territory here and should make a few more calls to the ministry for verification before proceeding. That many "big" kids will wreck havoc on the house and basically destroy it if it is not a space set up specifically for daycare - and remember it is not your house.
Your best option is to figure out how many you can fit into your vehicle and take only that many kids. Then you will be able to take them out each day to a park, indoor play area, pool, etc. But word of caution - if you are new to daycare this is not the age group or program that is the best way to start. Learning to handle a group within the confines of the home first before venturing on outings is a lot safer