Here is a planner that shows an easy setup to get around 170 AP for SUPER CHEAP and it is super easy. If you have any questions, feel free to ask. This post is directed to our new/returning players. It even has a crystal setup for you as well, each class will vary with crystals/off-hands/etc.. http://bdoplanner.com/s/ehb5AfWI
To add further on this thread different Green Offhands are BiS (Best in Slot) until you are ready for Nouver and/or Kutum. Warrior/Valk: Vangertz Shield Ranger/Witch/Wizard: Steel Dagger Berserker/Dark Knight: Saiyer Knot Sorc: Jubre Talisman Musa/Plum:White Horn Bow Tamer: Needle Trinket Ninja: Estique Shuriken Kuno: Estique Kunai Crystal can vary depending on your main burst skills (personal preference between the special attack gems; Back/Down/Air/Critical). Once you are ready to acquire Boss Gear Awakened Black Spirit Crystals 5ap + 150Hp are the universal choices for tankiness and damage, some classes may vary with this selection. Rosar or Specific Class Evasion Offhands are an end game item even past Nouver/Kutum for use in evasion builds (recommended level 60), this path should be ignored until you can cover at least 210+ ap with a rosar offhand.