Without a uni degree it will be hard for you to get any independent employment because there are strict rules about levels of education and prior experience needed to justify hiring foreigners.
But if your wife sponsors your visa, you can be employed by her (or her family's) company. Other members can speak more about those legal ins and outs. Maybe you (or rather your wife, with your help) could start a small vocational school of some sort. It would be a challenge though. With three kids to support, I would not try it unless I had a good, multi-year plan in place that included being able to support my family on savings/my wife's earnings for several years.
Another thing to think about is schooling. Be sure you are either happy with enrolling your children in public schools in Indonesia or can afford private schools, which vary in cost and quality.
Health care is another issue you should consider. If everyone in your family is healthy you will probably do just fine in Indonesia. If anyone has a special health issue, though, you might want to think about how their needs for treatment and medication will be met.
I probably sound rather discouraging, but I am not trying to suggest that you don't make a life in Indonesia. Far from it - this is a great place to live and I wish you luck. (My son was mostly raised in Indonesia and I think the Indonesian attitude toward children is wonderful. He is a very loving and secure individual, and I am sure all the affection he got from everyone in our household made him that way.)