Welcome!
Ok, first off sounds like you're in Jhb. If you're going organic, which it sounds like you have with the 'living soil', then use organic nutes and not salt based nutes like Nutrigold. Look at Bud Juice's range, BioBizz's range or B'Cuzz's range of organic nutes. A two part nute is usually best because it's simplest to use.
Don't waste money on a soil PH meter, get an all-in-one pen (EC/PH/PPM) and that will do everything you need. Buy once, cry once (they're not cheap). Then you'll need PH Down and PH Up to maintain a decent PH. A microbe solution like EM Pro Soil is great for additional microbials in your soil.
Look up 'pinching'/'topping' and how to do it. Some LST (Low Stress Training) will help your plant get better coverage and spread out wider.
Oh and get a quality pressure sprayer, like the Gardena one. Spray your plants once they get to about their 3rd/4th set of leaves with a good organic pesticide to keep the bugs off. Keep spraying regularly.
That's it! Simple as that