How to write a hit

Fingers so sore from learning the chords, Getting the rhytme without knowing the words. It all sounds so good here in my head, Blood from my fingers turning the fret board red. But I've got to keep trying, just carry on, Or the thoughts that inspired me will be lost and all gone. I've got to decide on the ideal key, And think about where the verse and the middle eight will be. The words that I write will probably change, They all have to be within my own vocal range. Some songs take ages and some not so long, But eventually I will have another hit song?