Put all your elemental points on one spoke of the wheel. click it to rotate it based on the element. if you're a tank, turn to the 'toughest' against hte element. if you're a DPS turn to the most damaging. do that forever. if you supermax eureka you can have maxed out one spoke, and then compliment another with a point or two, but no one does that these days unless you mean to do baldasian arsenel like a mad lad.
you MUST progress through the weapon for each step. the armor unlocks toward the end, and the glow glow armor in the last overland zone. you don't have a choice but to do each quest in sequence, max your weapon, and do the completion arc in each zone. the armor is the optional part. so buy the glamour sets you want with your spare elemental juice. i uhh ihave a guide here some hwere, let me see.
at the bottom of this guide is links to each other zone and step:
ffxiv.gamerescape.com
this site is used to track spawns with people in zone. they'll shoot linsk to it if you get serious:
FFXIV Eureka NM pop time tracker
ffxiv-eureka.com
this video spells out some crazy shit that's unique to eureka:
Godspeed in eureka, a lot of FF players don't have stomach for punishing game play and/or grind. I thought it was fun and not too bad, but i haven't been to the arsenel yet. i unlocked it and 'have a crew' but RL beat me up.
if you have any pointed questions i'll be glad to answer. the zones are cryptic and weird as fuck.