All the commands are "similar" to the dbpro commands (there are no spaces). There's a "Dark GDK.chm" file in the SDK. It has most of the commands (some are missing, but you can look at the dbpro help to get the command you are looking for and simply don't use spaces).
If you are unfamiliar with C++, you should read up on it. It's mostly intuitive, but you have to know where to start. There are several C++ help references on the internet, so have a look.
Any specific questions, most of us can help you with so feel free to ask.
The fastest code is the code never written.