Playermodel help

[troubleman]

I followed a tut on how to add player models to my pointshop & i think I got it all other than, where do I add this part so they show up?

if (SERVER) then 
player_manager.AddValidModel( "Master Cheif", "models/halo4/spartans/mastercheif_player.mdl" )
AddCSLuaFile( "mastercheif.lua" )
end

list.Set( "PlayerOptionsModel", "Master Cheif", "models/halo4/spartans/mastercheif_player.mdl" )
if (SERVER) then
	resource.AddFile ( "models/halo4/spartans/mastercheif_player.mdl" )
	resource.AddFile ( "models/halo4/spartans/mastercheif_player.dx80.vtx" )
	resource.AddFile ( "models/halo4/spartans/mastercheif_player.dx90.vtx" )
	resource.AddFile ( "models/halo4/spartans/mastercheif_player.phy" )
	resource.AddFile ( "models/halo4/spartans/mastercheif_player.sw.vtx" )
	resource.AddFile ( "models/halo4/spartans/mastercheif_player.vvd" )