Greatings

, this is the first time i wright here, and the first growing aswell. Iīve got a few questions that need to be considered before I start my growing.
What i have got so far is!
-10 bagseeds (
Skywalker Ū)
-1x 400w HPS (
Econo 400w HPS with Chrome Reflector-Inside Sun)
-lifetime supplies of first class icelandic water
1. Co2
-What ways are there too control it?
-price range..?
-how important is it really?
2. the Plant
-what is tha plantīs optimal condictions for growing?
-what should i be most focused on during my growing?
-are nutrients necessary?what should I eat for lunch ?
Ok this is all i can think of asking for now, if there is anything you think i sould know about or just some things that i sould keep in mind plz let me know. I am going to focus veary hard on this growing but like the most of us i dont have too much cash to spend, so i will be looking for practical solutions. Iīm planning keeping a Growing Jurnal.