How should girls be initially taught about

I found out about periods from my friends and cousins when i was about 8-9...but when i got them for the first time it completely slipped out of my mind and when i saw blood i thought i got hurt because i fell on the floor a night before i got them...for a day i was like why am i bleeding and since it was really less i still couldn't figure out but yea i did take my mums napkins without telling her but on the second day when it became heavy duty i freaked out...after 7 days when it ended my cousin told me she got her and then i realized that i had started as well...funny when i told my mum she was like so thats where my pads went and i was wondering why a full pack suddenly had only 2 pads left...quiet embarrassing.