Thank you, Kuchlar & Marcus for your help. I did google yamadori & found some good sites with information. I'm quite willing to be patient & wait a number of years. The nice thing about doing this is the small tree will still be a thing of beauty even if it's not a true bonsai for a long time. And the process itself is pleasant. I'm not an impatient sort except in some ways. Never with plants or growing things.
We own a reasonably large yard so placing small trees in pots & putting them to one side where I will still notice them will be fine. I have an area that I put my pots where I'm rooting woody cuttings that has shelter, sun/shade & a ready source of water. It will be perfect for attempting bonsai. I don't expect to become good at it but will find satisfaction just making small potted trees that look nice to me.
I was a few miles out of our town in the more wooded areas & was surprised at the huge
numbers of small trees, waist high & less, along the road side. I will return later to dig up a few specimens. Here, it's not illegal to do so as there's so many around & every few years, the road maintenance crews mow down vegetation along the roads to stop it from encroaching too far.