first grow 600w Day 8 advice needed

hey guys so i just got my 600w last night and it has been on my baby for 10hrs and so far it is still getting used to the light but is starting to pick up growth pretty quick.
i got the sinowell 600w ballast and sino MH bulb and ive never seen A 600w in action in real life and it just doesnt seem that hot or anything i have one fan circulating air and my temps are at 77 solid so i guess thats fine but should it be more powerful have you guys had experiance with sinowell.
i will start feeding it nutes on monday or tuesday i have the full line of general organics do you guys have any experance with this and how should i introduce the nutes to the plant and whAt all should i feed it.
sorry alot of question but if you could answer a few it would really help.

I wouldn't give any nutes yet wait few weeks then add quarter strength and go up from there slowly until u think they can handle what u want to give me I say keep it on lower doses and keep plant healthy dnt shove tons of nutes at it
O AND COME JOIN US ON THE 600 CLUB THREAD ALL UR QUESTIONS CAN BE ASKED THERE GREAT GUYS AND NO BULL S$$T

thanks man ill keep that in mind and ill check it out.