Hello just need to ask when to say thats is the first week of flowering when we switch to 12/12 or when the first pistils appears ? 
Gidday. I count from flip but time don’t mean much. Harvest when ever they at level of cloudy or amber that you prefer. Best of luck👍
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With autos I count it as soon as I see them clustering up
Count from when pistils appear just remember flowering times from breeders are a rough guide
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This is generally the accepted point. 65 day flowering plant, if counted from the flip could be as little as 45 days which obviously means plant isn’t mature yet.
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It was explained to me that first day of flower is 7-10 days after plant displays sex. I could be wrong
That’s not a bad generalization - I usually find that its 9-12 days after 12/12 before I see real clearly defined flowers.
When I switch…i then write down each week on a piece of paper so I know where I’m at in flowering.
Ex.
Week 1: 9/1-9/7
Week 2: 9/8-9/14
Etc… all the way up to week 10. This helps knowing where your plants are in the growth phase as well as following a nutrient schedule, and flushing. Normally by week 8 or 9 they’re ready, but some sativas go longer to 10 or 12.
Crowns y’all. Crowns. When you a cluster of calyx/pistils. So buds… that’s day one of flower.