The following is a list of functions and their associated hooks as they stand when the theme is initially activated. I have included one or two examples to get you started on using this information to customize the theme if you so choose. The documentation and tutorials will grow as time goes on and questions arise.
Post Title
Post titles are displayed via the following:
Hook
eighttwenty_before_entry()
eighttwenty_before_entry_summary()
Function
eighttwenty_post_title()
Chances are you will not need to remove the titles nor will you wish to put them below the content for any reason so I will omit an example of how to do so.
Byline
Hook
eighttwenty_before_entry()
Function
eighttwenty_byline()
You may decide that you prefer to have your bylines display after the post, which is an option that played with. You could do this by adding the following to your custom-functions.php.
remove_action('eighttwenty_before_entry', 'eighttwenty_byline');
add_action('eighttwenty_after_entry', eighttwenty_byline');
Post Meta (Post Date & Read More Link)
Hook
eigthtwenty_after_entry_summary()
Function
eighttwenty_postmeta()
You may also be interested in having a look at the other available hooks. Or check out the list of theme filters.