Keep in mind that in CGI there are basically two types of programs that people use:
Modeling programs where you can MAKE your own stuff from scratch
and programs like DAZ Studio and Poser where you basically take pre made models of figures and props and pose them in scenes which you then render( make a picture of).
If you wish to make you own models you'll need something like Blender,Hexagon,Wings3D,Modo etc.. (there are lots of modeling apps). In DAZ Studio and Poser you can customize the figures using morphs, but you really can not make one from scratch. You can make truly awesome art using DS and Poser though. don't worry about modeling yet... learn to make renders first.