i started in rockwool from seed, but germed them with the paper towel method, i fill my table three times a day for 15 min with a 5 min drain time. i used a construction/general use 2ft x 3.5ft tub from lowes/homdepot, check the first link in my signature it has a pic of my set up. for two 1000w hps thats a lot of juice man, for my set up i would need to double my tables/res for a 1000w im only using floro's for veg/cloning and a 400w for flower, and the 1000w are too powerful for seedlings/clones you could do about a 5x5ft tray under each one for flower and as for how many plants just depends on what style of grow your doing, im planning on doing a sog grow, where i only want the top buds off a lot of smaller plants and trimming the rest of the branches so i can pretty much fit about 4 plants per sq ft. but if you do scgrog you only need a fewgood plants to fill a screen. but the sog is more of a continual harvest type deal, you cram as many as you can fit from clone's and as those are about to finish, you clone the next batch so that when the first set finishes the clones are ready to be put into flowering if i do the whole tray i estimate about a oz off each plant and i can fit about 16 comfortably so i hope to get about a pound every 2 months or i could only put 8 plants a month apart so i get about a half pound every month instead of waiting for the whole thing. and so on and so on.