Mandala Seeds have an excellent "grow guides" section on their website with LOTS of useful facts and information.
If your grow doesn't improve after reading it, I will eat my hat!
Otherwise........
Premium soil blends designed for vegetable and herb growing and if you are into organics and simple to use, Bio Vega and Bio Flores made by Bio Canna or Organic Grow and Organic Bloom made by B.A.C. are hard to go past,..........one bottle for veg and one bottle for flowering......super simple!
I have used both these lines of nutrients for many years and can say the provide exceptional results.
All these things may seem a bit expensive, but with the soil, it is THE most important thing, so don't skimp here, and the nutrients I suggested are very concentrated, so you don't need much and a bottle will last many, many plants or multiple grows.
I hope this helps and good luck..........Organoman.