C.A.D.D. is an acronym in the architecture and design world which stands for Computer Aided Drafting and Design. AutoCAD is a specific (and widely used) software program which is used for this purpose - digital blueprinting and modeling of 3D items. It's fairly expensive on its own but you should be able to get experience with it through a school, internship or certification program. It would all depend on what is in your area.
Aaron recommends the following next steps:
AutoCAD is easy enough to learn on your own or you can take classes. I myself am self taught but only use it for 2-d purposes. You can also use the program for 3-d. As time goes on all these programs become more and more intuitive.
Architecture is a great career but it is definitely not about AutoCAD. It is about design, health, safety and welfare of your end users. It is about listening and working with all kinds of people. You can focus your skills on certain building types, such as, residential, multifamily. commercial, institutional, educational. mercantile and the list goes on. You can be a jack of all trades that does many building types as well.
Good luck in your search!