First, you should join the forum and start a journal. It’s a great way to get input from other growers, and it’s nice to be able to look back for reference. Everyone here is pretty good people, and only out to help each other.
That’s a decent light for the price, but you can do so much better. There are some DIY lighting theads you should have a look at. Even if a DIY build isn’t something you’re into, a lot of the kits can be assembled and tested for a small fee from a lot of the places selling them. Talk to @dbrn32, @MAXHeadRoom and the like for specifics. They can help you find the most for your budget. I wish I had found this forum before I bought my lights, but I could’ve done worse, too.
You’ll want to look for sativas, mostly, probably. Do some research on the seed banks, and some of the strain database sites you find when you Google search something like “Durban Poison strain info,” and look for strains whose genetics come from hotter climates (Durban Poison, for example, originally grew in hot ass Africa). But keep in mind, these strains will likely grow vigorously and tall.
This depends on how you want to grow these plants. One in a scrog that size would be great. A couple topped and trained would fit okay. Or even a sea of green of maybe 4-6 plants would even work. Autos might be slightly smaller than the typical photosensitive variety of the the same strain, so you might fit slightly more. You’ll get a better feel for this once you’ve had a grow where there’s room left over, and a grow where you’re begging them to stop growing lol! I would start with just one, or a couple autos until you get a handle on it. Depending on the height available, you might even be able to divide it into two spaces and stagger two, or even four plants, so you can harvest twice as often…
5-gallon buckets work great for lots of people outdoors. You’ll want to make sure they have lots of holes for water to get out and oxygen to get in. I would start in smaller containers and transplant them up as they grow, maybe into as big as 7- or even 10-gallon pots, if they’re headed outside, but maybe only 3- or 5-gallon if they’re staying inside, to keep the size down. I would use cloth or felt pots for best drainage.
And I agree with @Countryboyjvd1971 and the setup he described. If you can find a good quality tent that’s 3’ x 4’ and as tall as you can fit in the space you have, it will save you a ton of work fixing light leaks (although this isn’t really an issue with autos), sealing the environment, etc. Plus, they’re already reflective and somewhat insulated to help with environmental control. A couple good fans and a carbon filter (if you care about smells) are a great investment and essential for climate control. You can get creative with ducting air to and from the space, too, especially if it’s connected to an attic, basement, or crawlspace.
Depending on where you live, you may have missed the window to get them outdoors this season, but this sounds like a solid plan for at least a couple plants start to finish, indoors.