[support] i need help with views 2 in drupal 6.x

i'm trying to theme a view using views-2.x but i don't understand the new way for do this, how can i customize the format of the nodes in the view? how can i use the $content, $title, and $fields variables ? The view is very simple, just filtering a content type. But i need specific format for the output. thanks in advanced for all of u