Always interesting to see how other people compose their sermons.
Here’s a couple of examples.
It helps to see that while the actual delivered sermon is an expression of an individual personality, common patterns within the preparation process can be identified.
Alistair Bain provides a detailed outline of his sermon writing process.
From Darryl Dash:
A couple of years ago, Peter Mead posted a series of questions based on Haddon’s method. I’ve printed them out and posted them beside my desk. In case you’re interested in my preaching cheat-sheet, here it is in PDF. I find it helpful to think through these questions as I move from text to sermon each week.
mgpcpastor's blog 
Yes. We need to do all we can to make sure that the congregation cannot say at the end of the sermon “so what?”
That’s why we need to be able to answer the question “what do I want my listeners to do?”