1. The biggest change is the advent of the potential system. Equips you find can have a chance to be "potential". Purchase a magnifying glass from potion shops to reveal the potential. You can also use 70% or 90% potential scrolls on current equips, but if they fail, they break the equip. Because of this system, the drop rate for equips was increased 10x the old. You'll get a potential equip about as often as you got a regular equip before the drop rate increase.
2. Don't worry too much about items for now. Collect the Witch's tokens (part of the halloween event) and turn them in for 4 zombie rings. Each ring gives +1 all stat, +100 hp/mp, so getting all 4 will be +4 all stat, +400 hp/mp. This is incredibly helpful for bowmen.
3. Hunt for your equips now.
4. Training and selling decent potential equips.
5. Zombie Lupins north of ellinia are amazing training with Arrow Bomb. This area alone was reason enough for me to max AB before Mastery.
6. If you want to stay at Zlupins until 50, do enough for 6 booster, and 2 Soul Arrow, then max Arrow Bomb. If you want to do other things (like CPQ or questing), max Mastery before arrow bomb. By 70, everything except FA will be maxed, so do it in the order that best suits your needs.