This is for the models and sounds but I don't know what to do with the materials.
PHP Code:
PrecacheModel("models/weapons/c_models/c_flaregun_pyro/c_flaregun_pyro.mdl", true);
PrecacheModel("models/weapons/c_models/c_motor_flaregun/c_motor_flaregun.mdl", true);
PrecacheModel("models/weapons/w_models/w_flaregun_shell.mdl", true);
PrecacheSound("sound/weapons/flaregun_shoot.wav", true);
PrecacheSound("sound/weapons/flaregun_shoot_crit.wav", true);