The following post is based on my experiences and opinions:
1. What ranged options do DRGs have? Can they wear Bomb Cores or are they limited to a Tiphia Sting? What should a DRG put in that slot when he's not throwing Agnons?
None - Tiphia Sting is the best.
2. Homam Hands/Potent Belt or Dusk Gloves/Speed Belt? (Or is it Swift? I can never remember the BC one) And with which setup should you wear OHat or the turban?
Homam/Swift Belt combination - Turban
3. Homam Legs or Barone Legs (I'm guessing Barone should only be macroed in for Jumps, or am I thinking about Barone Corazza?)
Both - Homam for TP, Barone/Conte for WS and Jump macros
4. On that note, Barone Corazza or Homam Corazza for TP build?
Homam
5. As I understand it, Neptunal Head and Legs are not easy to get (HNM drop vs. sky drop). While waiting for those, what is the best piece of gear to swap in for weapon skills? Same goes for Ace's Helm - I don't think my friend will be getting that any time soon.
Wyvern Helm (+1 if lucky) (Head) - Conte (Legs)
6. Is Peacock Charm *really* worth it at endgame when you're fighting VTs when you can put a Chivalrous Chain in there for a fraction of the price (as well as STR and Store TP)?
PCC all the way. If you have no sea gorgets, get a Chiv Chain for WS
7. Can DRG wear Fowling Earring and is that the best for the 2nd slot after Assault Earring?
Yes, but it is not the best in my opinion. Brutal/Triumph earring if you have the gil/beastcoins. Otherwise, Assault/Fowling are fine alternatives.
8. Can DRG wear a Warwolf Belt? If not, what would be best for WS build?
Yes.
Here's what I've got so far:
TP:
Main: Mezraq +1
Ranged: ???
Head: Ohat or Wturban ???
Neck: Peacock Charm or Chivalrous Chain ??? (in lieu of sea torque)
Ear1: Assault Earring
Ear2: Triumph or Fowling ???
Body: Homam or Barone ???
Hands: Homam or Dusk ???
Ring1: Raja's
Ring2: Sniper's
Back: Amemet +1/Forager's
Waist: Potent Belt or Swift ???
Legs: Homam or Barone ???
Feet: Homam
WS:
Main: Mezraq +1
Ranged: ???
Head: Hecatomb Cap
Neck: Elemental Gorget
Ear1: Assault Earring
Ear2: Triumph Earring
Body: Hecatomb Harness
Hands: Hecatomb Mittens
Ring1: Raja's
Ring2: Flame Ring
Back: Amemet +1/Foragers
Waist: ???
Legs: Hecatomb Subligar
Feet: Hecatomb Leggings
I assume you want the best setup:
TP-
Weapon: Mezraq (or +1 if you're lucky and find one)
Ranged: N/A
Ammo Slot: Tiphia Sting
Head: W.Turban (or Ace's Helm if applicable)
Neck: PCC
Ear1: Brutal
Ear2: Triumph
Body: Homam
Hands: Homam
Ring1: Rajas
Ring2: Sniper+1
Back: Forager's (or Cerb+1)
Waist: Swift
Legs: Homam
Feet: Homam
WS-
Head: N.Head
Neck: Sea Gorget (or Chiv Chain if no sea gorget)
Ear1: Brutal (ws double chance)
Ear2: Triumph
Body: N.body
Hands: Alky. Bracelets (imo)
Ring1: Rajas
Ring2: Flame
Back: Foragers/Cerb+1
Waist: Warwolf
Legs: Conte
Feet: N.Feet
(Note: not taking into account salvage gear due to it's rarity and lack of experience on my part)