I'm a first time grower on a budget. I have never grown before. I have some Ocean Grown Kush seeds from Norway that I will be using. I have a 2.5 x 2.5 converted shower as a grow space. I was able to pick up a 20 x 20 Hydro Farms Metal Halide Hood and Bulb. The bulb is 400W. I plan to grow 6 to 8 plants. The only ventilation I have is a bathroom window. I have some seed starter and some cannabis cultivation books. Not able to invest allot of money into this grow and I'm wondering what supplies are must haves for a good harvest? I was also wondering what kind of ballast I need to get my lamp working?