good and bads about 12/12 from seed

what problems can you encounter from 12/12 from seed? im wanting short plants i've seen some that are like 1 foot tall and just 1 bud like a cola thats what im wanting is this autoflowering? or is this 12/12 from seed? I need any and all advice so plz throw'em out there if you have done 12/12 from seed let me know how it went

The plants you have been looking at were most likely clones that were flowered from rooting. No additional veg time.

I have flowered from seed and it took 4 weeks to show pistils. Some phenos will respond to 12/12 immediately, while others will wait until they mature or until they're just damn good and ready.

there's only one thing and that's it is not a mature plant yet,

no veg time, even autos have a veg time of 9 10 days. but go with 20/4 0n lights,

so there gonna grow normaly just slower? 20/4? for how long?