Do Tokens hit the graveyard?

A: Tokens go to the graveyard as regular creatures, and are removed as a "state-based effect" when a player gets priority again. They stay in the graveyard long enough to trigger abilities, like the one of Soulcatchers' Aerie, before they are removed.

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Does First Strike negate Deathtouch?

Deathtouch only "works" when the deathtouch creature deals at least one point of damage, so if the first strike creature deals enough damage to kill the deathtoucher, then it dies before dealing any damage. So in that sense, yes, it negates it. Do board wipes affect Hexproof? Granting hexproof to a permanent or player doesn't cause opponents' Auras to become unattached. A card that has 'hexproof' is still affected by board wipes that don't target specifically that card.

Consequently, does hexproof stop deathtouch?

No, Hexproof only means that the creature can't be the target of spells or abilities your opponent controls. But Deathtouch is not an ability that requires targeting. Deathtouch is a static ability that means any amount of damage dealt by a source with deathtouch is enough to kill the creature receiving the damage. Can you sacrifice a Hexproof creature? A player can be targeted by this ability and choose to sacrifice a creature with hexproof they control. Finally, as hexproof only affects opponents, in multiplayer games like two-headed giant your teammates can target permanents with hexproof that you control.

Does the rack target MTG?

The rack never targets anything, there is no interaction. Does shroud protect from board wipes? Do Board Wipes Kill Shroud? Board wipes can kill shroud creatures. Board wipes don't target creatures but rather destroy or otherwise remove all creatures at once without targeting any of them.