golfer,
“Are we careful to be mechanech them properly, to do it first without understanding, and then to continue as their cognizance grows?”
Yes. You have heard of children being given a candy or prize or a star when they do something correct like davening properly and other mitzvos, haven’t you?
“Are we being mechanech them that they are obligated to be concerned with the welfare of others?”
Yes. By collecting tzedaka for others who need tzedaka, this is perhaps one of the greatest forms of chinuch they can acquire.