Once you've leveled up alittle after pulling the sword (lvl 3 will do), go into Potos. Go to building with the pot on its outside; this is the item shop. Buy and equip a Bandanna(50 GP) Now go to the upper-right house where the elder is waiting for you. After a little dialogue and a couple events, you'll be up against the game's first boss, the Mantis Ant. He's not hard. If you're level three and have the Bandanna, he'll barely be able to damage you. If you do die someone will just revive you and you can continue the fight. Hit him from behind to do max damage to the boss. He will jump ever now and then to change locations so just run behind and continue hitting him till he dies. You will get a Sword's Orb after defeating him.