Hi @VilPel
Great question. I will try to explain in a simple way. Dataverse comes in two different versions
1. Dataverse for teams
2. Dataverse
I have added the hyperlink for you to get deep insights into why there are two variants available. In simple terms, Dataverse for Teams capacity is 2GB. If you design an app and the data exceeds 2GB then you need to start paying for the excessive storage capacity. So think in the long term perspective of the application usage so it is better to pay for a Dataverse (aka PowerApps) license which will come with good capacity plus other benefits like data types, files, etc( See link provided)

Also Regarding the office licenses, based on the requirement you mentioned, the Office F3 license is cost-effective for your scenario which will cover your requirements then F3 license will include outlook, planner, one drive, etc..
So you can pick Office 365 F3 + PowerApps license ( depending on my previous reply)
If you do need Teams then Office 365 E3 + PowerApps license ( depending on my previous reply)
If you do need Teams + Power BI then Office 365 E5 + PowerApps license ( depending on my previous reply)
Hope it is clear now.
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If your users don't require Teams
