Okay let me explain. Since you have GMax, you need to find a .3ds formated file to import. No once you have imported it you can modify it at will but to export it you must have the quake plugin installed so you can export to .md3 format. Once exported you can convert it to .3ds by using 3d exploration. For you textures you save them as bmp in your painting program and then apply them using lithunwrap or your 3d prog(I prefer the second method). Once they are applied convert the bmp to bin using the bmp converter. Put the 3 .x and the 3 bin in a zip file and rename the extension to .rmd. Your model is now ready to be installed using the model importer. If you have any perticular question please ask.