Upon launching Fire Emblem Heroes for the first time, you'll be prompted to download game data. Ensure you have a stable internet connection. After the download, you'll go through a brief tutorial introducing the core combat mechanics. It's highly recommended to link your Nintendo Account immediately. This safeguards your progress and allows you to transfer your game data between devices. To link, go to 'Misc.' > 'Account Management' > 'Link Nintendo Account'. You'll receive Orbs as a reward for linking, which are crucial for summoning new heroes.
