It sounds to me like you have more work yet to finish...
I wonder what version of 3dgs you have...
If you have the pro version there is a lot you can do to create a finished looking project...
But... upon completion I suggest you look at "Inno Setup"...
http://www.jrsoftware.org/isinfo.php
It's free and it compiles you project into a single self extracting exe file.
Best of luck...