The Pill for Dummies?

I'm 18, not sexually active, I'm starting the pill today (that is if I don't freak out anymore.) I'm taking it to regulate my period. I just got done with mine yesterday. It's a 28 pack with 26 active pills (28 combination, 2 strictly estrogen) and 2 reminders with iron.

I know the basics, take it at the same time every day, but I'm still curious about a lot and have questions.

The pamphlet that came with it said I should start on the day I get my period but my mother told me to start it yesterday on Sunday. Should I wait?

And how will I get my period on it? I know most people have a 21 day pack and a week where they actually bleed, but no one talked to me about this type of pack. I'm really lost and really stressed..

EDIT: I forgot to mention my doctor/gyn didn't say much. I went in for a pelvic exam and asked for it to regulate my periods but that was about it.