You start with either Rexton Leathers or Skull Shoulder Pads. For Rexton Leathers, it's Dragon Forest II and for Skull Shoulder Pads, you have some options but I'd say it's The Hidden Dragon Tomb II. Whichever one you choose to start with, you will likely end up with more Wooden Shoulder Pads than you need. Therefore, it's a good idea to collect one Etc first, then start with the other one until you reach 400 Wooden. After that just buy the remaining Skulls/Leathers (usually around 200K each)