Choose a topic; narrow the topic; consider your audience and purpose; and gather details
Explanation:
Choose a topic. You should know what you would like to write about.
Then , you should decide the reason why you would like to write about that topic. In fact, you should say what it is that you would say about the general topic.
Picturing in mind the audience will help you set your purpose. For example, Will you write for mothers interested in the education of their toddlers? Will you help them choose a good nursery school?
Once you have set the previous steps, you can gather the necessary information about your narrowed topic; for your audience ;and for your purpose.