First things (IMO) should be agreement on:
1. Name.
2. HD.
3. Proficiencies.
4. Equipment.
1) This should be easy.

2) d8. Seems to be the default for support classes, and lets you slightly increase the power budget of class features. A hit point increase can also be baked into tougher subclasses, much like Draconic Sorcerer.
3) Skills: Pick 3 from Athletics, History, Insight, Animal Handling, Medicine, Perception, Deception, Persuasion, Intimidation. Rogues get 4 skills out of an 11 skill list, monks get 2 out of 6. 3 out of 9 seems a good compromise, warlord seems to be a slightly more skill oriented class.
Saves: I feel like mental makes sense? Int/Wis or Wis/Cha?
Weapon/Armor: Light, Medium, Shields, Simple Weapons feels right to me. Martial Weapons and Heavy Armor make sense as subclass features.
4) Modifed cleric equipment makes sense, assuming medium (possibly heavy) armor and simple weapons.
- (a) a spear or (b) a rapier (if proficient)
- (a) scale mail, (b) leather armor, or (c) chain mail (if proficient)
- (a) a light crossbow and 20 bolts or (b) any simple weapon
- (a) a diplomat’s pack or (b) an explorer’s pack
- a shield