In Word Press blogs there are no indents and paragraphs by default. Ordinarily when you hit the <Enter> key you get a single line but not a paragraph. When I was trying to test this, I found that if you hit the <Enter> twice you get a paragraph break.

The indentation is a separate issue.  I was reading that most bloggers don’t indent their paragraphs.  But if you want to indent a paragraph you use the style.css and add

text-indent: 20px;

For my template, posts are defined by the CSS class: storycontent so that’s where I would add the text-indent line to my style.css file.