Can I say: I don't know much formality?

English as a Second Language English Vocabulary, Grammar and Idioms
1

Hi, my name is Jose Baudrand and Im a chilean songwriter.

Could anybody please help me?

Can I say: I don’t know much formalities (or formality), I don’t know much economy?

Many thanks to everybody!

Jose

2

Songwriters can say anything they want to, so you can say that-- and it is grammatically OK.

3

Mister Micawber,
I don’t know much formalities.
I don’t know much formality.
I don’t know much economy.
I don’t know much economies.
Please confirm if all above sentences are correct.
Thanks,
Er. S.M.M.Hanifa.