Music Bussiness breakthrough...lol?

I wanna be a musician when i leave school next year im 15 atm and i have wrote myself a few songs so far, and i dunno if i can sing tho? im hoping i can as i always sing around the house, i loveee music and think its amazing :) just wanted to know how would i go about putting beats with my music? i cant play any instruments, and how would i go about making my music pure i want it to be alternative/indie :) thanks