100% New to this. How do I make a blog read top to bottom?

http://codex.wordpress.org/Function_Reference/query_posts#Usage_Note

For example, to set the display order of the posts without affecting the rest of the query string, you could place the following before The Loop:

<?php global $query_string;
query_posts( $query_string . '&order=ASC' ); ?>

assuming you are talking about the main post page, edit the template file index.php (might differ in your theme) and apply the above mentioned lines.