How do you start using the pill?


GUYS HELLO.
First of all I live in Turkey so I was not sure whether Yasmin is an international birth control pill or not so I added a wikipedia thingy too. Anyways. my questions :
I want to use birth control pill. We use condom with my boyfriend but still...
But I didn’t go to a doctor I just went to the pharmacy and bought Yasmin. Some of my friends use it too and they are happy with it.
I read the instructions but still I wanted to be sure.
Should I start taking it on the first day of my period?
When should I give it a break and then start taking again?
Have you used it? If so, any side effects you’ve experienced?
Any info is appreciated. I don’t know why I am stressed about it but I am. Thank you for your answers in advance!
Achieve your health goals from period to parenting.