I asked a very similar question awhile back --
https://www.rollitup.org/outdoor-growing/148195-any-southern-us-growers-outdoor-3.html
You might find some useful things there... one thing that struck me: preparing your soil in a hole big enough to accomodate a MJ plant that's been growing outdoors with no physical / lighting limits for 6 months or so. That's a helluva root ball... I think someone said 4 feet square and 3 feet deep or such.
I will say this as a gardener of many other things in the southern states: you can't overestimate how punishingly hot it is here in mid-summer. We humans can go inside when we've had enough... plants have to just take it. I've seen lots of shit literally melt in the span of a few days -- many plants labeled " loves hot sun!! tough as nails..!! blah blah blah). Your plants have to be watered just right - not dry, but not too wet either. I would highly recommend about 3" of an inert shredded bark mulch around the bases of your plants once they get up a bit and the summer heat starts coming on, and water deep once a week. This will really cut moisture swings without introducing saturation or root rot. Don't mulch deep around a small plant -- you'll cut off air exchange in the soil.
Hope that helps..