Go to the Story Maps Gallery to see some great examples, handpicked by the Esri Story Maps team to highlight creative approaches and best practices in a wide range of subjects and industries. You can filter and search the gallery to check out how authors like you have handled stories that may well be similar to the one you want to tell. Explore. Get a gut feeling for what makes a good story. Borrow approaches that you think work well, or come up with your own!
Go to the Story Maps Apps page to browse the available templates and choose the best one for your project. Each template lets you deliver a specific viewing experience to your audience. There are templates for map-based tours, points of interest, in-depth narratives, presenting multiple maps, and more. Spend some time comparing the templates, the layout options they offer, and the different components they let you incorporate in your story.
From exploring the Story Maps Gallery, you may already have a good idea of which app template will work best for you. If not, there's a wizard on the Apps page with an 'Ask the Pros' feature that can guide you to the best app template for your story.
Now that you've finished your story map, you simply share it to your audience. You can share your story map publicly or restrict it so it can only be accessed by people in your organization. Go ahead and promote your story map to your audience. Link to it or embed it in your website. Write a blog post about it, share it on social media, and so on.