Thank you Jeff,
I can tell you what method I use, but the more you read in this forum, I think you will find that there are many effective systems, and it is likely that you will want to find one that matches your property and lifestyle.
I had wanted to start with biochar for years, but I couldn't find a method that I thought I could really use. This you tube video was the first one that I saw and realized that I could make biochar, so I patterned my system after it. All of the other people on this forum have helped me immensely.
I live in a suburb, so I need to make biochar in my driveway in a closed container. Your land may be different. Some people on this forum use open topped troughs, some use the trench system, many use retorts, and many others have invented their own systems. I think if you read the posts here, you will likely find one that works really well for you. I think almost all of us here continue to learn and adapt our systems as we experiment and hear from others.