First of all, the template in use is "rjb", not "custom", so if you're making changes to "custom", you won't see them.
This list is a bit outdated, but it'll give you a general idea of files you might want to tinker with when creating a custom template.
- includes/languages/YOUR_TEMPLATE/english.php
- includes/languages/english/YOUR_TEMPLATE/index.php
- includes/languages/english/YOUR_TEMPLATE/meta_tags.php
- includes/languages/english/YOUR_TEMPLATE/header.php (to change the logo)
- includes/templates/YOUR_TEMPLATE/template_info.php
- includes/templates/YOUR_TEMPLATE/common/tpl_header.php
- includes/templates/YOUR_TEMPLATE/common/tpl_footer.php
- includes/templates/YOUR_TEMPLATE/images/logo.gif
- includes/templates/YOUR_TEMPLATE/css/stylesheet.css



