What map size for Open World?

Hello there
I’m a complete beginner and pretty illiterate when it comes to numbers.

I have a question about landscape size. Screenshot

There are the parameters:

1) Scale
2) Section Size
3) Sections Per Component
4) Number of Components
5) Overall Resolution

I would like to create an open world map. An island, the island itself should be 50 km². Since the ocean will take up a lot of space, it has to be about 100 km².
Unfortunately, I don’t know how to implement this, because I can’t get along with these parameters, because no matter which parameters I change, they all seem to contribute to the size and change the size of the map.

I have activated World Partition. I want good resolution as well as performance for myself and the player. What values do I have to enter to get my desired size?

Topic resolution: I have also read that 4033 Overall Resolution is sufficient, is this correct?

I would appreciate your help.

Kind regards