jus a few quick questions from a begginer.

Hi follks, I'm new to forums
My pet monkey is going to be growing the old skool organic way pretty soon and has jus a few noob questions:

He's going to be using 11 liter plant pots, will he need a few clay pebbles in the bottom for good drainage?
He is going to be using BioBizz all mix soil, for which he will start a scheduled feed of Bio Bloom, Bio grow and top max during the whole flower stage. it also sais on the biobizz chart that he should be using root juice too throughout the veg and flower stage, he knows not to follow the measurements and schedule on that chart provided but was just wondering if he should be using the root juice?
also alg-a-mic? should he use this too or will there be enough magnesium in the soil for the whole flowering stage?
He wanted to sow my seeds straight into 11liter pots, is this cool? is there a need for a smaller potting in the begging and then a transplant in to the 11l pot?

All answers are very much appreciated, my monkey had heard this is the best place to learn how to grow super fine homegrown goodies

Something like that in the bottom will assist with drainage yes. I am not sure if theres enough micros to last throughout, I like to use my own mixes and add my micros so I know exactly whats there. I'm not saying what yall are using is bad, just not sure, but adding some more micros wont really hurt. The reason people start in smaller pots, is because of the waste of time to get that large pot ready and not have anything pop. You start small than you know exactly what you have, than transplant. My 2 cents, good luck!