"all that shits confusing to me lol"
Me too, I've just been picking up bits and pieces so I can know what it all means.
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What kind of high/stone do you want?
Soaring, euphoric, trippy, couchlock, spacey, no ceiling, social, contemplative ... ? So much in the Seedbank description about everything but that, maybe a few words or one line. The high/stone should be the first thing they're talking about.
"how many should I grow:
5' x 5' x 7' = 25 sq ft x 50 W HID / sq ft = 1,250 W HID use a 1000 and get some UV side or floods. My grow area is 4.5' x 4.5', I can put a 2' x 2' hydro unit in the center and JAM 12 x 5 gallon buckets with tomato cages on the outside. I can hold 16 x 12" clones or 8 x 24" clones in the hydro unit. I like just 8 plants and 8 clones. In 5' x 5' you could squeeze in 16 double topped plants, in 5 gallon buckets, if you had tomato cages. Fewer plants and more space between the plants will let light get to the lower branches and develop more bud.
Get good reflection on your walls - white paint or Reflectec is good.
You can grow anything with that height, with a bit of height training. Cellar's a good spot, check the windows from the outside with the light on. Humidity shouldn't be a big problem, get a dehumidifier if it is. I've read that dry air promotes trichnome growth but haven't read a conformation.
" 9 weeks max ... good yeild ... what strain"
White Widow, Northern Lights, AK 47, Endless Sky, Trainwreck, an autoflower, ...
Pick the kind of high you want first.
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...crazy deals to 
