Depends what you are trying to do, but if you want to be gangster with it . I would go to YouTube and watch making soil on the build a soil channel. If you don't want to make it yourself. Go to buildasoil.com. they have the kits to make It or you can get pre-made, but the shipping can be expensive. They also have a shit ton of information for free. If you want some books to read I can give you some bad ass recommendations. The intelligent gardener teaming with nutrients and teaming with microbes