Watch this guy until 1:19 And do what he says to your model. Ofc you can paint your own texture etc.
Than find the texture you used.(can be any format of picture. .jpg, png, bmp etc.) Open it with photoshop. Save as "bodypart"_obj.tga.
Export your object from blender. Rename it "bodypart".obj
("bodypart" is the part your object will appear on. head, r_biceps etc...)
Now go to Toribash/custom folder. Create a Folder Called 3dtextured
enter there. right click, new, text document.
open it with notepad and paste these
item.dat text
Save as "item.dat" in 3dtextured folder.
now copy your "bodypart".obj and "bodypart"_obj.tga into 3dtextured folder. open game. /lp 0 3dtextured and it will appear.