I'm making a game where you are in charge of a small coastal village in the 8th, 9th century Scandinavia. I want the game to be as accurate as it can be without compromising the gameplay, Ideally it should make you think like a real Jarl.

I have done some research in my spare time and have a few ideas. (Things like the importance of trade and livestock, the somewhat equal status of women, The possibility that visitors could be gods in disguise) I can only do so much research myself with my limited time so I thought id ask the internet what they think is important that I include.

What are the must haves, the important to emphasizes, the do not dos and so on?

edit: Also what are some good sources I can look into for further reading?