Oops All Druids

With Patch 8 and Circle of the Stars coming out, I am planning a "Oops All Druids" run, where the four members of the party are each of the four circles. (Land, Moon, Stars, Spores)

Land (Druid 10/Tempest Cleric 2) - Water + Lightning Combos
Moon (Druid 12) - Tavern Brawler
Stars (1 Rouge/Druid 11) - Durge/Basic Cha Prof and/or Expertise
Spores (See Question 2)

  1. What kind of gear should I be looking for a certain druid? (Like Circle of Bones is good for the Spores Druid, but not the others)
  2. Which form of the Spores works best between 12 Spores Druid, 11 Druid/1 Wizard, or 6 Druid/6 Wizard? If I multiclass, should I start Wizard or Druid for the purpose of using magic items?
  3. Do I need CHA expertise or is proficiency good enough?