Welcome to the Dark side.
There is lots of great info on this forum about making charcoal. I have yet to try the barrel-in-a-barrel or the barrel + barrel-chimney-on-top versions (Ask Ray Menke about that, I think he is nearing 300 batches with that setup!) I am working on a retort system, and chasing the elusive goal of “how little wood can I use to get the process started?” Also I want to try and use the heat to dry more wood, as here in the NW I have a short window to dry stuff out. I think there is a lot to be said for keeping it simple, though, especially if you have plenty of wood. I look forward to seeing what you come up with!