How to limit posts in a news category page?

I’m sorry if it is in the Wiki or template manual but I couldn’t find it. Okay, here is my simple dumb question in a non-vague of sort of a way.
I’m currently working on my small college’s student newspaper website and my stories are seperated by “news categories.” How do I limit WordPress on how many “news posts” on a news category page. In other words, I want to have a link in my news category page called, “Next Page.”
My WordPress setup has default settings with no hacks. It has the standard “index.php?p=xx” link-style.
I have a lot of “news posts” for each “news category” and I don’t want my visitors to have a long scroll. Thanks….