Ok first off, you can't look at gear by just blue, purple, green etc. Some greens can easily be way better than any blue! The current best gear in game is Allagan gear and AF +1 for equipment and or Penta Melded Lvl 70 gear (Vanya,Gryphonskin etc) Weapons will be Allagan and or Relic+1. All raid/dungeons are unlocked through NPC's. Try exploring Vesperbay and Dragonhead, and you may find a npc that allows you to get some of the dungeons after completing certain tasks.