Listening is quit a good advice!!!
As mentioned in the post before listening is quit the best.
For myself, ideas often come while working with reason. Playing around with the sounds and effects, i just let the sounds itself play and watch the way it takes...
Then i start to put a bit structure to it, like intro part etc. I try to set up a raw version that goes from the beginning to the end. Later on i start the fine work adding additional fill ins of the drum, fx sounds etc. and do some variations of the sounds alreadys in there.
But nevertheless trust your own ears ever!!!