New@burning DC games.. Little help please.

Hi, im pretty new at burning DC games and need a few pointers.
For instance, I have a .cdi file and was told to burn it with Disc Juggler. Do I just load it into Disc Juggler, and start writing or what? Is this a typical ISO? What other options do I need to mess with?
Also, what other formats might DC games come in and where can I get additional help on those?
I didn't find any answers to my questions on the sites I looked through.. maybe i'm just looking in the wrong place? Any pointers?
Any help is appreciated.
thanks.