Maintenance for the week of March 25:
• [IN PROGRESS] ESO Store and Account System for maintenance – March 28, 9:00AM EDT (13:00 UTC) - 12:00PM EDT (16:00 UTC)
After you buy the game on steam you need to go to the Account page here, set up an account and register your game key.
also you need to start a Subscription or redeem a game time card in order to get the 30 days free.
Never argue with Idiots
They drag you down to their level and beat you with experience
@dustindeedoering_ESO -- If you haven't already, please make sure to follow the steps suggested by @Brabok in the comment above. These steps are reflected in this knowledge base article, which may be of additional assistance to you. Let us know if you encounter any further issues with this.