Are you using textures that you made you self? If so then the textures must be in either JPG or TGA format cause for some reason quark converts the textures to TGA.
Check that the textures work in the texture directory which quark makes. If they don't work just replace them with a texture you have converted to TGA yourself and in therory it should work. Also have you put lights in your level?
Quake 3 maps should be placed in a pk3 file along with the textures dir and scripts dir.
so inside the pk3 should be the directories:
[maps] [textures] [scripts]
Put the pk3 file in the project directory and in dbpro type in
load bsp "pk3name","maps/mapname"
Once you start down the Dark Path, forever will it dominate your destiny...