In the new tutorial, you start on the mysterious Isle of Balfiera, a small island within the Iliac Bay last seen in The Elder Scrolls II: Daggerfall. Home to ancient Direnni ruins, the isle is beset by dangerous monsters thanks to the appearance of strange portals, and it’s up to you to help the mage Norianwe investigate their emergence—all the while, learning how to play the game! Complete the tutorial to open a portal room in which you can then choose which map you begin in based on what content you own. You cannot enter a portal to content you do not own such as "Blackwood", "Western Skyrim", etc.

Currently skipping tutorial is spitting people out in random places. Some into Wayrest in Stormhaven, and others into chapter zones they own. Don't know if it is a bug as of yet, or intended.

This is the first base game main questline.
Alliance starting maps are:
-Aldmeri Dominion: Auridon map, Vulkel Guard town
-Daggerfall Covenant: Glenumbra map, Daggerfall town
-Ebonheart Pact: Stonefalls map, Davon's Watch town

Depending on your alliance, you will go to your alliance's starting map and look for a "hooded figure" which for example, in Auridon in Vulkel guard, they are on a big boat at the dock sitting at a table on the captains deck. Once you speak to this figure you will begin your harborage questline which will take you through your main questline for the base game.

The other main questlines that are supposed to be done along with your harborage questline are:
-Mages guild
-Fighters guild
-Alliance/zone questline

The mages guild questline can be started, of course, at the mages guild (Any mages guild will direct you to the questline). Same goes for the Fighters guild.

Alliance questlines are supposed to be done alongside the Harborage questline (and one needs the other to finish the main questline of the base game) (Note: Finishing the base questline will give you access to "Cadwells silver" and "Cadwells gold" These questlines are Azura's reward to the player, letting them experience the other alliance's main alliance questline as if they chose that alliance instead, so do not be confused when you do either of those questlines and they talk about as if the events you took place in never happend yet!) Alliance main questlines begin in these maps based off from your character's alliance:

-Aldmeri Dominion: Khenarthi's Roost map
-Daggerfall Covenant: Stros M'Kai map
-Ebonheart Pact: Bleakrock Isle map

Follow the questline here to lead you to Auridon, Glenumbra, and Stonefalls which will continue your Alliance quest. If you do not go to your alliance questline beginning map first, you may get a bit confused if you do Auridon, Glenumbra, or Stonefalls first as the questlines are a continuation of what happens at Khenarthi's Roost, Stros M'Kai, and Bleakrock Isle.

Meet with the stargazer outside your alliance's capital to go to Craglorn map and begin this questline. Locations per alliance are:

-Aldmeri Dominion: Grahtwood map, Eldenroot town, heading towards the stables
-Daggerfall Covenant: Stormhaven map, Wayrest town, across from stables
-Ebonheart Pact: Deeshan map, Mournhold town, Northeastern circle path

Use the Alliance war queue. This questline doesnt "have" to be done, especially if you dont care for pvp. But if you want the full in order story, this comes next in the questlines.

Any starting city, Stuga will run up to you and follow you a bit. Talk to her to begin this questline, and take the cart to Orsinium.

Any outlaws Refuge, speak to Quen to begin this questline.

Any outlaws Refuge, speak to Amelie Crowe to begin this questline (can also find her on the docks in the Gold Coast map near the npcs playing a game, located near the lighthouse a bit).

Cradle of shadow and Ruins of Mazzatun dungeons

Almost any inn in game, look for Alessio Guillon to begin this questline. Can also be started in Seyda Neen.

Bloodroot forge and Falkreath Hold dungeons

Mage's guild hall (Starter alliance area or capital of alliance area) "Order of the Eye Dispatch" begins this questline.

Fang Lair and Scalecaller Peak dungeons

Vanus Galerion in one of the starter city Mage's guild halls. Can also begin by finding Raz in Summerset along the road outside of Shimmerene.

Moonhunter Keep and March of Sacrifices dungeons

Any starter city for the prologue quest, NPC is Concordia Mercius. Then speak with Famia in Lilmoth in the Murkmire map.

Frostvault and Depths of Malatar dungeons

Speak to Anais Davaux, or Abnur Tharn in a starter city

Moongrave Fane and Lair of Maarselok dungeons

Contact Hizuur in a starter city who directs you to Kasura.

Icereach and Unhallowed Grave dungeons

Prologue stars with Lyris in the Fighters guild in a starter city

Stone garden and Castle thorn dungeons

Find Gwendis at her camp in Aldmeri Dominion Auridon, Daggerfall Covenant Glenumbra, or Ebonheart Pact Stonefalls.

Travel to Grayhome Island and talk to Gwendis.

Travel to Markarth and speak with Verandis outside the city/right near the only wayshrine first unlocked on the map.

The Cauldron and Black Drake Villa dungeons

Pick up the quest starter from the in-game Crown Store (located under the Quest Starters category)

Having arrived in Blackwood, speak with Captain Rian Liore outside of Leyawiin after picking up the quest in the Collections Menu or getting it from Brigadine Antonius (Brigadine can be found near wayshrines in Gideon, Leyawiin, Telepe).

Red Petal Bastion and Dread Cellar dungeons

The Cauldron and Black Drake Villa dungeons