high everyone attempting my first grow

everything seems to be going well in the 2nd week of flowering; im growing indoor in soil under a 400w HPS light but i only have a 4'x6" area to grow in so space is limited, that said, i have only 6 plants growing right now; 2Master Kush, 1 skywalker,1 blue dream, 1 afghan kush and a sour diesel. can the experts please give a novice any tips that pertain to any of these 5 strains. e.g. light time, nutrients schedule, also nutrient brand reccomendations, temperature, CO2 amount(s) also if a CO2 system is completely necessary and maybe some other tips i cant think of right now, nutrient doseage(s) thanks:jointsmile: