inserting models

[swamp-cecil]

i know there is probably a thread about this, but i could'nt find it
i am making ANOTHER map (bucieus), and it is similar to nievieus. anyways, i want to insert models of players and structures, but when i put them in gtkradiant (i am taking the md3 from main.pk3), it dosent show them ingame

OR

how do i insert character or building models from trem? i know the misc_model

[swamp-cecil]

help plz!!