Fox Farms Ocean Forest or Happy Frog soils. Just do it and don't listen about Pro-Mix or coco at your stage of learning.
I agree very good soil for beginners and experienced growers as well. I like a 50/50 mix. Ammended With EWC, Epsoma Garden lime, blood meal, bone meal and happy frog High P bat guano for flower . i als add 2 Cups of Epsoma garden tone.
I brew a nice broad spectrum AACT like boogie brew or sometimes just EWC, liquid Kelp and mollases.
I hit them a couple times with some fish emulsion. And last but not least Mycorrhiza.
You don't need all this stuff if your using synthetic liquid ferts. Just follow the directions on the bottle but start at half strength.
Also, Roots organics is good soil. IMO.
Peace