You don't clone autoflowers. They flower on genetic age, not photoperiod, so that doesn't help at all, and can actually kill your yield by breaking apical dominance while the plant is going into flower on its own.
If you bought feminized seeds, you'll have to force a herm to self-seed.
If not, yeah you just keep a male and a female together. Kill all your males but the strongest. You'll get seeds. So will the neighbors...
If you want to breed outdoors you're gonna have to keep your plants in pots and move the breeder male inside back under lights the moment he shows to avoid seeding your own, and everyone else's, crop. When the male drops pollen, bring the best female indoors to hang out with him . Rub them together. Shake the male over the female like a he's magic mike. Make it rain (pollen). The whole plant will get seeded and the seeds need about a month to ripen before harvest, so don't chop until they are good and brown and stripey or you've wasted a whole plant. Seedy bud AND unripe seeds is just a shame.
You can try covering most of the female with a plastic bag and leaving a couple branches out when you pollinate if you want more of the plant to be smokeable.
Don't expect the next generation to be a 100% perfect replica of the last. A lot of stuff on the market is f1 hybrids from specific lines the breeders do controlled crosses from for seed sales. And an f1 from known lines is more predictable than an f2... the dominants traits show consistently in the f1, but you'll see weird recessive in the f2.
Good luck!
