Requirements for using How-to-set-up-wordpress.com is very simple.
1. A domain name. My recommendation is Godaddy. You can purchase domain names very cheap through them and I have used just about everyone and have never had any issues with them.
2. For my services you need to use Hostgator. On some occassions I will make an exception. It is case by case. My preference is Hostgator.
Other than these there is nothing else you need!
