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<p style="text-indent: 30px;"> or whatever units you want for the size of the indent.
If you mean to indent the entire paragraph, you could use css again, and use code such as
<p style="padding-left:30px;">
And one final word, being the purist typographer that I am. If you examine most books in print, you will see that the long established convention has been to EITHER have a double line break between paragraphs OR to indent the first line of a new paragraph (but NOT the first line of the first paragraph). Using a first line indent and a double line break at the same time is redundant, and actually slows down reading speed slightly. So doing both is not traditionally considered proper typesetting.
However, this doubled up practice has spread rather fast with the advent of desktop publishing. Strict traditionalists still consider it a bit of a "barbarism" however.