Can u plzz tell me all about firsr periods nd i have a few questions too?

I'm 12 nd I have not had my period. I just wanna know wut it feels like. I have a few questionsto ask: does it feel like ur peeing in ur pants when u first start? Will blood go everywhere in the toilet or no? How come I have around my breast? How come my breast have not grown that much? Plzz answer