How do I start ? Total Newbee

[%u]

Hi and thanks, I finaly got it to work and this what I got

gcc --versiongcc (GCC) 3.3 20030304 (Apple Computer, Inc. build 1666)
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

gdc --version
gdc (GCC) 3.3.6 (gdc 0.19, using dmd 0.162) (looks like a different build)
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

But when I enter the command...
thats what I get,
gdc nothing.d
gdc: nothing.d: No such file or directory
gdc: no input files .
Do I need to save in a certain dir? O change dir before I write this command?
TIA