Well i see that you are not good into coding as you are asking all these things that you need.

I would suggest you use DDL CMS, you can just search it on KWWH u will find a thread there is the download link aswell and full support aswell. They also offer free themes for it and all. Plus has loads of new features.

If you are advanced WCDDL is very good this is if you know how to customize stuff on php and also make new themes and all.

Well to start a DDL site on wordpress would also be good but you should know the modules and plugins that you will need thus customizing will be a challenge for you.

Let me know if you need any more information.

Thanks & Regards