Let's hope your HTML does have paragraphs. You could then use some CSS like this:
Code:
p {
text-indent: 2em;
margin-top: 4px;
margin-bottom: 2px;
}
This sets the paragraph indent to 2em (twice the width of the letter M in the current font), 2 pixels spacing above and 2 pixels spacing below the paragraph. Normally you would only use one of these. The units can als be cm, mm, in, and a couple of others.