?I need answers please read? First time i do this?

Alright, let's say you use 3ds Max.... And you make a widget.... And you save it as widget.3ds, CG Trader wants you to upload the file, widget.3ds.... That way someone can download/buy your model, and get more than just a picture :) Hope it helps :D

There are plenty of file formats like: OBJ, 3DS, FBX, DAE, ASE... More file formats - more chance, that someone will buy your creation. The most popular is OBJ and MAX. To save your model in particular format, you have to export it to that format in your software. ;)

@groch I believe he's having trouble just uploading his original files..... Let him start simply, and learn as he goes ;)