When the game first starts and you are in the castle, go to where you get the Small Lithograph and the Fire Rune. Go to the bridge where you came from and fight all the enemies. Next, go back into the place where you get the Small Lithograph and Fire Rune then exit. Keep repeating this and you will get all sorts of stock, mainly Medicines and Red Stones. You also will get experience points that make you stronger. To get even more items, when you fight use the Counter Guard. You will get Tactical Bonuses and more items.