you can grow regs and pick out the male, you will know the male first once you flip, take him out and let him grow separate and collect the pollen then dust. you dust the female plants and yes all regs.
you want female seeds either use sts or col. silver, both are easy to make and use, i have had more luck with the sts, or silver thisolate spray, what you do is you spray, and the female will reverse making a male that puts out only female pollen. i have made two strains one is a super skunk in bred all female and i made a cross with it that produced all female seed. now trying to collect that female pollen, well i have not succeeded yet and ive been spraying for a few years now.
it is work and it is a lot of stress spraying, as some strains will produce pollen, and some strains will not produce much if any. so you spray and go through the it all and the not knowing part, if it worked is very stressful, if you want seed and you want them to be sure then use a male this is fool proof, spraying there is a chance it will work as well as it will not work.
here is a shot of the super skunk that was reversed, but has the male flowers but it also had female buds
the males look like bananas