Since you're just starting out, I wonder if you know of the "Editor" function for Steemit posting. It allows you to format the text of your post.
At the beginning, after you click "POST," make sure you click "Editor" on the top right of the box. Then you can input all your test and format it as you desire.
After all the text is formatted, then you can click "Raw HTML," and input all the photos or other images or any links.
Also, here’s a link to a recent post of mine, about How To Enlarge any photos or images that you post. With this, you can essentially make the photos twice as large.