Virtual jpop idol group

I'm trying to make a virual jpop idol group but i have no idea how to do the music (っ˘̩╭╮˘̩)っ I already have the designs and I'm doing one of the models.

My idea is to do the music, UTAU(but maybe I'll be using pocket singer app), choreography and animation. 

I already have planned what the music is gonna be about and the clothes they're gonna be using ᕙ(⇀‸↼‶)ᕗ but i know nothing about music production.

I think I'll just wait till my birthday to buy an instrument and learn music (ノT＿T)ノ ＾┻━┻