you've got the semi metal and fiber gaskets .. you can put them on dry or with a few different things.
some have used silver or copper paint like you mention.. some use copper coat. I've even heard of indian head gasket sealer.. as well as avaiation gasket sealer.
your machine.. your call.
if head and block deck are good.. you should not need it.. probably won't hurt either.
as to gasket type.. some life the soft fibre.. some liek the metal... goes both ways.
some nead gaskets claim to not need retorquing.. for instance.. some felpro are like that.
me? I always retorque.. sometimes a few times.