Biochar/Terra Prieta and hugelkultur

I can get the organic matter in any amount in form of prunings from trees and shrubs. I guess most suburban gardeners can get this simply by calling some gardeners and you will have the stuff delivered at your doorstep. Usually it would go to the tip.

At the moment I use it to make huegelbeds as the bottom layer. But cutting everything up by hand is a lot of work.
My idea is to use some of the material to produce charcoal and using this in a huegelbed.

The twigs and braches are delivered green. How could I produce the charcoal without an extra charcoal burner in an easy fashion?
Could I build up the huegelbed and burn it? How do green twigs burn? Would I still have to cut everything up?
I search for an intelligent but simple way to incoorporate huegelbed and charcoal.

Does producing charcoal create a lot of smoke? (I don't wamt the fire service to show up)

Yes, charcoal can be made emiting almost only CO2 and Water vapor. But you need very dry biomas and an efficient kiln and youtube has many instructional videos about how to make one. Kilns can be made with recycled barrels, cob, bricks and maybe other materials too.

Be sure to charge it with compost and to use biomas not contaminated with heavy metals. Organic contaminants are not that dangerous becouse they are destroyed at hi temperatures.

Good luck.

Oh and do a serch, I am doing one right now and I see some topics on the forum about biochar.