The first step is to prepare all the materials you will need for your magazine. This means that you need to look for inspiration and decide on the overall aspect of your magazine.
Do some research and write your articles, select the photos that you will use in your magazine and edit them. You can use tools like Adobe Lightroom or Adobe Photoshop.
Decide on the layout. Think about how you will use the images and how these will look in that format.
Next step is to actually open InDesign and create the document. Click File - New - Document or use the shortcut key Ctrl+N. Enter the specific size of the magazine, set boards, rules.
These are only the first steps that you need to take when you start designing your digital magazine in InDesign, but we covered all of these on our blog.