It happens, every so often, that a pastor is totally blocked on sermon writing. No ideas at all. Nothing seems to click. So what to do? For the one-year guys, there is no better solution than this: Get Luther’s House Postils. (The Klug translation is apparently out of print – a tragic loss. You can still get it in a set w/ the Lenker Church Postils in the set. A web search will turn up some other resources. Good luck.)
Anyway, now that you have it, go through Luther’s sermon for the day. Outline it. (Summarize each paragraph in a sentence or two.) You now have a well crafted fifteen minute sermon, and you have begun to learn how to write sermons like one of the great masters. Repeat as necessary.