Want some advise please.

Does the size of the net pot have any importantance.will it determine the size of the plant.?any info is appreciated.

the bigger the pot the more room for the plant to grow, of coarse of your doing this in a dwc system then it really doesn't matter how big the pot is because the root are growing far beyond the pot anyway. This only really matters when it comes to placement on your system (putting enough holes for pots so you maximize your space but at the same time not crowd the gals so you get better light penetration

in a DWC the net pots are really just to give your stem something to root and hold on too... but your roots are only restricted to the area of your rez, since they will be growing out of the net pots and into the oxygenated water

got yuh ,thanks bro.