Writing a romance is like supervising a treasure hunt. After you pick a setting, story theme, hero and heroine, you select a starting place for the plot and go.
Along the way you discover their friends, mentors and antagonists. They can ramble until they find a sure-footed path or two, or run pell-mell into obstacles and disasters. You can channel them into plot canyons with only one way out, or drop them into a vast wilderness and accompany them on their quest.
A simple tool to frame the rest-stops on your treasure hunt is the following set of sentences. Answer them and you'll be well on your way to a winning story.