struggling setting up the Registration Modifier module

Hi all a bit of a drupal novice, I am struggling setting up the Registration Modifier module.

In the read me setup there are a couple of steps I do not understand.

"5) Create the content types based on your observations in steps 3 & 4 such that you minimize
the number of pages, but separate required/non-required, and common/non-common items. This
may result in one or more content types with only one field, depending on your situation.
That's okay!!! With the pageroute wizard system, it really isn't important to jam a page full
of fields, and in my opinion, looks cleaner anyway."

MY understanding is by creating content type would be located (admin/content/types) and in here I am creating a new type of content with my own definable fields???
If so how do I add fields, do I need the CCK module to achieve this???? As there is no option to add fields.

Also when enabling the Registration Modifier module I get the following error. warning: Invalid argument supplied for foreach() in /home/mysite/public_html/modules/nf_registration_mod/nf_registration_mod.module on line 1241.

Can any one help