Best way to make gil in this game?

[Chardrizard]

Any tips on what equipment to meld though?

Here are the best slots to SB,

Heads (gives Heaven's Eye)
Waist (gives everything good)
Hands (gives Savage Might and INT)

Rings (gives STR, Hell's Fist, Heaven's Fist)
Wristlet (gives Touch of Rage and HP+ materia goes for 150k these days)
Choker (gives INT most of the time)
Earring (gives PIE and DEX)

You can also do Legs but i personally don't do that slot often.

Weapons do gives good materias too but i tends to wear the best weapons to fasten SB process overall.