New grow need help

Im goin to grow with the GH waterfarm bucket plus airstone ....im goin to drill extra holes in the top for extra root growth. Im using a 400 watt mh fer veg 18 on and off 6 an 400 watt hps for flower 12 n 12 of course . Im a lil confused on how much of the florBloom n micro to use n how often to change res? N how to do it witout hurting the roots ? Please help !! Greatly appreciated
 
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