Custom models on Map!

I need help on how to make Custom Models appear in a gmod map i made.

Have you already modelled them?

If so:

If not:

No i mean i have putted some Team Fortress 2 Sniper Assets Pack models but they don’t show up when i load the map.

Add the custom models into the TF2 content. By that i mean put them in TeamFotress2 Models folder.