Tbh i would start out with a blend like
gaia green, roots organic, or down to earth so you can get used to how to mix, how long to cook, and how long it takes your amendments to become available to your plants. You learn how to read your plants. Anticipation is crucial in organic growing. If youre not proactive it will be a long hard grow. Once you get a handle on that then you can get into individual ingredients and make you own mix and top dressings. I like down to earth single ingredients for my mixes. Been using a lot of
roots organics too. I lean towards roots these days because its more pulverized and is available to your plants sooner, and they include inoculants so you can pretty much get rid of recharge. Regardless of what you do, keep it simple because alot of people go overboard and mix different shit in that serves the same purpose. Waste of money to an extent.