In my idea i hear countries with no money and stuff but why doesn't the Goverment just print money? Is there a rule that stops countries from doing this?

If they do that its useless. Even we can get inflation

Because it fucks up the economy, making the value of the dollar less. :|

Money = debt

You may have heard of something called prime rate.
It's an interest rate the central bank of a country puts on the creation of money. Banks of issue can order new money for said interest rates.
Without economic growth that system collapses because there'd be no way to counter the inflation. A small rate of inflation is also essential as without inflation there'd be no way to pay said prime rates.
Printing new money would actually increase the debt as well as lower the value of a currency. It'd only be a short term soluton to create artificial growth but it'll haunt you real quick.

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Ask Zimbabwe.

Shamed, son. Do some research.