The Vatican has produced many coin sets over the years. You need to know what year the coins were minted and also if they are gold or silver or not.
One can learn about value of old coins on the website Coins About. Most coin value guides give you retail prices; that is, they tell you how much coin dealers are selling the coins for.
That is the value just for the gold in the coin, not as a coin.
Which liberty coin?
Take the coin to a dealer or look in a book on coins for the value.
The circulation of a coin does not drop its value eg. 50p coins from 2012 Olympics.
Coins of another country have no value in Pakistan.
No, for silver coins as the value of silver changes the value of the coin changes. The same is true for gold coins.
You don't. You don't EVER clean a gold coin and you don't clean a silver coin. Cleaning ruins the value of coins! If it has any collector value at all it will be demolished by a cleaning. Cleaning can take a $100 coin into a $10 coin. It will never, ever improve the value of the coin unless you literally dug it out of the ground. Do not clean coins.
There are several factors that determine the value of gold coins. One factor is how much gold is in the coin. Gold is valued by weight, so the more gold the coin has, the higher the value will be. Also, the age of the gold coin. Older, rarer coins will be worth more.
No. Coins always lose value when they are cleaned when compared to uncleaned coins (the exception being coins that are dug out of the ground that are encrusted in dirt). Do not clean your collectable coins!
You need more information, like do the coins have dates, what is the condition of the coins, where were they minted.
A £5 coin is the exact same value as a £5 note or 5 £1 coins etc