400W MH/HPS. First Indoor grow ever!

Hey all! This is my first grow ever!

keep it short n sweet.
using a 400w mh/hps. bagseeds have been in soil since nov. 7
they are on 20/4 getting water about every other day. starting 12/12 tomm.
no nutes yet just tap water sitting out for over 12hrs. leave me some feedback positive or negative....im just trying to get better!

put some pics up of the tent n babies. i think they got a little heat damage but not sure. let me know. putting more pics up later.

just found this site and im so addicted, ill be updating everyday almost. cant wait to see how they turn out!

hey guys im thinking about trimming them tomm once i start 12/12 but im not sure on how to do it exactly and help would be awesome? i know you want the colas to get the most light n all but how much and what do you cut? fan leaves? bottom of the plant?