Hello Love.

I've been thinking, even though I like have nooo idea how to play the guitar, I really really really wanna learn so.
I will
and I've started to write a song
But I have no idea how it goes.
How do they do these things. Not just the Jonas Brothers, EVERY band.
It's so hard to do the things you love.
How how how how how how how how how how how how?????
Please help. Thanks