How big are the pots? I have tried a few variations, and I am still trying to hone in my exact "mix", but I can tell you that the rocks are uneccessary and the plant matter is better just mixed in with the soil. I would recommend looking for either an all inclusive mix (sometimes expensive i.e. Fox Farms) or mix your own. I prefer to mix my own, that way I can control exactly what goes into the mix. You can find plenty of grower's personal mixes here by just using the search function, but a basic down and dirty mix would require dirt/topsoil/peat, drainage (pearlite), and food (ferts, oragnic matter like worm castings or mushroom compost, or a combination).
Mix well, and then pot up and monitor/document. If you are newer to it, I would try two different "loads" and see how they work out for you.
I have tried this mix in the past,