We not simply call our product as Website Builder
- you may there create any website.
and from one side you say
- "Advertisment board" - very simply
from other you say:
- OS CCK - very complicate.
OS CCK is very simply, for create good website you no need Know PHP/CSS/HTML.
all what you need:
- aim and understanding of site which you need
- you need know which forms and fields you need
and if you not wish create all from zero, you may use some our website builder templates
- OS CCK Classic - Demo
There you will need remove , all Entity which you no need, and remove/rename fields
Shoe Store Free eCommerce Joomla template
There you will need only remove/rename fields - and may be buy Pro version
And if you have some questions - you are welcome.