And to get the post spam going early, here are our opponents' starts:
Norway; +2 Naval movement (does not apply to embarked units but does to GAs):
Denmark; +1 Military policy slot:
We get +1 Economic policy slot. Probably the weakest power of the 3 but there's a couple useful things.
Starting Districts
The scenario has a limited district palette: only Harbors, Commercial Hubs, Encampments, and Holy Sites are available. Harbors are unique to Viking civs and are half price. Holy Sites are gated behind pillaging our way to a religion so won't show up until mid, possibly late-early, game.
All starting districts also come with a Lighthouse/Market/Barracks.
Sweden
Köpingsvik: Harbor, Commercial Hub
Birka: Encampment
Ladoga: Commercial Hub
Denmark
Odense: Commercial Hub, Encampment
Ribe: Encampment
Roskilde: Harbor
Norway
Nidaros: Harbor, Encampment
Oslo: Commercial Hub
Stavanger: Harbor
So everybody has 2 of what you'd expect and 1 of each of the others.
Starting Units
Sweden
3x Berserker
1x Archer
1x Settler
1x Builder (3)
2x Trader
Denmark
1x Longship
5x Berserker
1x Archer
1x Trader
Norway
3x Longship
3x Berserker
1x Archer
1x Trader
The baseline looks to be 3x Berseker, 1x Archer, 1x Trader. We get an additional Trader, a Settler, and a Builder. Denmark gets a Longship and 2 extra Berserkers, while Norway gets 3 Longships.
We definitely have the most domestic start - but still have enough to take down Apuolė, at least once we get a Longship or two built. Whether we can snag Wòlin as well depends on whether the Danes rush it or focus their energies on Utrecht and southern Britain.
Note: we are at Always War with the city-states and non-viking powers - the Frankish, Moorish, and Byzantine Empires - and an alliance with the Danes and Norwegians. We don't share vision but do get open borders and some fairly lucrative trade routes between us.