put the following in the init line of the unit.
this addweapon "WEAPONNAME"
this addmagazine "MAGNAME"
(may need to remove weapons first, hence...)
removeallweapons this
also if you put the mags before the weapon then the weapons starts loaded.
as for music (and indeed all i've put above) you'll find the answers in the editor's depot or under the FAQs and the search option for the forums