Hi there! Welcome to GD fellow CBD grower!
I know it can seem like a lot at first. I'd encourage you to really look around at other diaries and sites like Royal Queen Seeds and I Love Growing Marijuana to get a good understanding of how the plant grows. You'll make mistakes, it happens, but it's a really rewarding process.
So LST is basically opening the plant up so you can get better light penetration. A lot of people use pipe cleaners to gently bend the branches down so you're getting a fuller, bushier plant vs a taller one so you have better yields. FIMming stands for "F*%^ I Missed" in regards to topping. So with topping you'd be taking off the entirety of the new leaf growth vs FIMming you're taking about 75% of the leaf off. Topping is more effective at reducing stretching vs FIMming can give you more top colas.
I really like the Fox Farm Big Bloom because it's all natural ingredients, and if you want to use something else natural, I use Fish Emulsion Fertilizer during vegetative growth for their Nitrogen needs. Later on in flowering you can use Bone meal for their elevated phosphorus needs and Kelp meal can help cover potassium needs as well as trace minerals. Unsulphured Molasses is another great feed for flowering stage which can help produce super sticky buds.
I hope that helps, and remember you can utilize the grow questions portion if you need help. Glad to see more CBD plants and good luck!
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