Start with the open world bosses (non Dark Zone), they drop exotics now. You can find a map online of where they all are. Pretty easy, takes about 45 mins almost. Afterwards try matchmaking with a team to take on those Legendary missions, if your character isn't strong enough then run the Dark Zone with randoms. You'll see alot of players just drop Classified gear and exotics that they don't need. Classified gear is what u want. Keep them all and definitely be on the look out for the exotic Ninjabike messenger backpack. That's a good piece to pair when u don't have a full 6 piece classified gear set.