Wubitog, if you do want to add ads, you definitely should take a look into MySQL. I learned how to use the technology along with PHP in a book called "Head First PHP & MySQL." It's a tad bit expensive, but well worth it. There are also many free tutorials out there to learn the two (
Tizag's), but I'd recommend the book.
You'll also need to learn how to use the MySQL C API, it will be frustrating as all hell at first (it took me four months to correctly compile my first C++ & MySQL program), but if you need any help, just ask and I can give you some sample programs I have. (In fact, I wouldn't mind writing a "How to use MySQL with DarkGDK," Tutorial.)
And you will need a testing server too. I'd suggest installing
WAMP Server. It's got everything, except the MySQL C API files, but you can get that from the official
MySQL Server Installer. Also, you have to install the
MySQL C++ Connector.
@TechLord
Hey, would you need someone to help you with PHP & MySQL development? I'm pretty damn good at that stuff. Oh, and if you need an XML Parser for S3DGE, have you tried
libXML? I had a hell of the time trying to get it work, but it's really nice once you figure out how to use it.
http://ref.darkgdk.us/ <- Online DarkGDK Refernece. More content coming soon.