1st time grow - pre-flower & nutes question

hi guys - im currently in week 3 of veg stage - im looking to switch to 12-12 in about a weeks time, so i thought id get the heads up.. so i have a few questions- any sort of help will be much appreciated.. its my first post

1. is week 1 of flowering stage the first day i switch to 12-12 ?
2. when do i start using the flowering/bloom nutes and stop using the veg nutes? the same day i switch to 12-12 ?
3. im thinking of doing the 36hrs of dark period before going to 12-12- whens best time to start using flowering nutes ?

yes when u start 12 12 you are in flower why would you have a dark period of 36 hours before flower?? keep feeding veg for first week or so in flower then switch to bloom

alot of forums say it stimulates flowering and speeds up the the time it takes for the small flowers to appear !!! anyone here experienced this ??

i havent got much experience as only grown 3 plants so far,may i add,they turned out very nice but you only do the 36hrs darkness after they have flowered and not before you put them into flower

When I'm ready to flower, I turn the lights off at 7pm after feeding them a week 1 of flowering feeding. The lights come back on at 7am. I see no need for extra dark, but the shift in feeding at the time of darkness is what triggers flowering. I begin to see pre flowers a week after that.