First - you got to feel some kind of something - a mood, anything.
2 - choose a BIAB style that fits the mood and the rhythm
3 - put the bars in one at a time as you choose the chords based on where the emotion and lyrics take you.
4 - check out www.taxi.com for pointers on songwriting (alot of info on that website)

I usually use acoustic guitar for my creative palette but I 've come up with some good songs (objective opinion of course )
using this BIAB style sheet method.

Usually first line of the chorus becomes the hook BUT the chord pattern of stuff like "House of the Rising Sun" "Stairway to Heaven" are hooks unto themselves. So hard to conceal.

Ian
My "Original Tunes" Site
My gene pool needs more chlorine.