There are more ways to write a story than there are writers. There are perhaps endless techniques and tools and philosophies. Start at the beginning and work forward. Start in the middle and give the reader a little of the beginning as necessary. Let character drive the plot. Let theme drive the plot. Don’t bother with a plot.
Here’s one more tool for your writerly toolbox, courtesy of Ray Rhamey at Writer Unboxed. I haven’t tried it yet, though I may do so soon. It looks (perhaps deceptively) simple and straightforward, and I can see this might be a useful tool for breaking through writer’s block.
After this, there is a brief discussion of one reason why stories are important. It’s something I hadn’t seen put into words before, but it makes sense to me.