first I will teach them to walk on a road, and to take the decision to go to the right or left, and if its a roundabout they can loop. these are the basic steps they need to know, where to go, if not there where else, what if I have to go round and round till there is a condition to finish.

I have never reached programming to a child, but I teached to older people starting with python. With young people I would start with scratch or a similar program. The idea is not to teach programming at all(not now, when the grow yes): you must try to teach the logic of the programming. You should check programs as scratch. For me the best idea would be learn playing. Hope it was useful!