How much currency should a country have? How the conversion rates of a currency are decided?

Is International Monetary Fund involved in deciding the total currency to be printed or cast? Which source of a country is taken into consideration while this quantity is printed? Why do we have a low international value of our rupee when compared to a country that even has a low growth of economy?|||These questions about how much money to print can't be answered unless far too much is printed, as Germany did after WW1 to slap the Allies in the face for demanding too high reparations. The subject is so far out of reach of any citizen or group of citizens and simply inspires us to take over government. so that we can print cases-full for ourselves, without even denting the local economy.