thats what you need
that is the md3 reference that they mention in the wiki page
Most this stuff is super old and hard to follow.
If you are just importing non animated models (like mapmodels) i suggest using the object files this is much easier to deal with.
also look at the model ref on how to define the tris and the textures:
the eaest thing is just to create a folder in side of models
then put the model and the textures in it
then create a new text file chaning the extention to .cfg, and naming it model.cfg
then just type the commands you want to use inside
if you have any questions search quadropolis theres about 30000000000 tutorials on this