❔ How to call a method that uses a struct in it's definition?

I program in C# with Unity most-often, I am branching out to 'normal' C# and am stuck on connecting a method to main in a practice project.

public struct sInformation

public struct sInformation

is used to define this method:

sInformation oIncome(int[] aoItemList, float[] aoItemCosts)

sInformation oIncome(int[] aoItemList, float[] aoItemCosts)

and I cannot find a way to run this in Main to actually begin working out the results. Any help would be greatly appreciated!