Hi Don.
I think what you are doing is great!
Last year, my boyfriend and I talked about moving in
Mexico. We stored/sell our things and packed the minivan with the remaining belongings and two months after, we were here. Finding a job wasn't easy (I'm still looking for one!). As for starting a business, the process can be complicated, bureaucratically speaking. Lots of paperwork. And doing business in
Mexico is very different from what it is in Canada, cuturally speaking. For instance, you cannot expect your suppliers to deliver on time -nor your employees to show up when they should. But there are options. Have you thought about opening a bed and breakfast or a language school? -I guess you can even do it under the radar which means no paperwork and less stress. But there are downsides: then you won't be sponsored by a Mexican company and won't be able to get a FM3 -which is necessary if you want to stay more than 6 months in
Mexico. Since you say that you can show proof of a monthly income from Canada, getting a visa shouldn't be much of a problem then.
Schools: there are bilingual schools offering an international curriculum. Best option if you want your children's academics to be recognized in other countries -they might want to attend a Canadian universtity later...
Cheapest way to do the move: buy a used minivan (bought a Dodge Caravan for under 2200$) and pack it up! Small electric appliances -coffee machine, toaster, hairdryer- are expensive in
Mexico so it's better to bring your own. I think you can bring one computer per adult (check with the
Mexico aduana - I'm not allowed to post the link). You will have to register your car at the border and put a sticker on your windshield -this permit costs around 20$. Driving your car down to
Mexico can take up to 6 days (it took us 4 days but we were driving very long hours) but it is a very good option because cars are as expensive to buy in
Mexico as they are in Canada -don't expect to find a better deal here. And with kids going to school everyday, you'll need a car.
Health coverage: if you leave Canada for more than 6 months in a row, you lose your coverage. Private health insurances are very, very expensive. This can be an issue, especially for a family with kids.
As for kids moving to a new country: you'll be surprised how easily they will adapt. My boyfriend moved to
Mexico with his family as a young teen (the best years of his life, he likes to say) and after returning to Canada a few years later, he couldn't stop thinking about going back south. And so he just did

Hope this helps