How to remove first line indent from article.cls

[Ryan]

I have a custom class derived from article.cls. The default style for
paragraphs is the first paragraph in a section is completely left
justified, and all subsequent paragraphs have their first line
indented. There is no space between paragraphs.

Instead, I do not want any paragraphs to have their first line
indented, and I want a blank line between paragraphs. What commands
in article.cls create the default behavior, and how do I adjust this
for my purposes?

-Ryan

[Ariovaldo V Garcia]

Put the command

\parindent=0pt

before \begin{document} 

Ariovaldo

[Ryan]

Thanks. I also found the answer to my other queation.

\addtolength{\parskip}{1em}

Added my linespace I wanted before paragraphs.