What can I use to layout the content type form input when creating content?
Display Suite is capable of formating form layout, as well.


  Modules included:

Display Suite: The main module to rearrange your fields.
Search: extend the search results for Drupal core or Apache Solr.
Extras: extra functionality like semantic fields, region to block, hide page title etc.
Forms: style the layout of forms.
Format: provides a PHP filter with entity context (only 7.x-2.x and higher)
UI: Manage custom fields, classes and view modes through UI (only 7.x-2.x and higher)



You should enable the Display Suite Forms module, which is shipped with DS.

Under the 'manage fields' tab of your content type

admin/structure/types/manage/your_content_type/fields


At the bottom, you have an option to select a layout for the form.