@Yeatster you are going to love making your own soil , the more you delve into the better the understanding you get , I would recommend you start simple , I started with used dirt - I call it dead dirt - I then made compost and studied all about that , then added some basic stuff . Planted some plants and I could see a change in the growth of my plants compared to the store brought stuff - [ have very little choice where I live ] I think the best way is to start off simple , then the more you learn and understand the better the soil and I still use organic nutrients as I still have a long way to go yet , I am lucky where I live as I can find stuff in my environment to study . I believe organic is not about yield , but the joy in smoking weed that you have had a lot more of a hands on approach to producing . I also believe it is a far better product [ in my area anyway ]
Now you are taking the first step ----
Warning --- it is highly addictive .