Usage of "flight of 2"?

I know the basic usage - Formation flights, but Can I know the full utilization/usage of the feature :wink:

The use of “flight of xx” is for when you are flying in formation or with others. It lets the controller know that the other aircraft you are with is part of your formation and to treat the flight as one aircraft.

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If i am flying my friend (just 1 friend)
what should be our callsigns

Me-Qatari 1 flight of 2
Fri.-Qatari 1 flight of 2
Me- Qatari 1
Fri.- Qatari 1 flight of 2