How do i start my own brand of jeans? i want to start from scratch?

I AM INTO FASHION AND I FIND IT HARD TO FIND THINGS THAT I REALLY LIKE & THAT CAN FIT BECAUSE I AM SOOOO TINY.SO I THOUGH I WOULD COME UP WITH MY OWN BRAND OF JEANS BUT I DONT KNOW HOW TO GET STARTED.WHAT DO I DO? CAN YA'LL HELP A SISTA OUT.