There are a ton of threads regarding lighting. Some build their own. There is a thread called “let’s talk diy lighting” that has a plethora of info if you look to go that route.
A lot of us are using horticulture lighting group LED’s because they just produce awesome plants over and over. If you have one plant, a qb135 kit in 3000k or 3500k would do you well for the entire grow. They are really good so they aren’t cheap like the $80 lights that advertise 1000w but are actually 100w (which doesn’t all come from the leds, they have fans that have to run which is eating up some of that 100w).
As for plant maturity, it’s usually around week 4 when they start showing signs that they are sexually mature.
Autos, while they may seem like they’d be easier since you don’t have to mess with lighting schedules, can be real trick and finicky. And the end result varies significantly between different phenotypes.
White widow feminizes is a good plant to get started with. Very resilient and resistant to mold/rot/diseases.