There are many ways of storing coins.
A major don't is to store them together in a tin or box.
Any movement can scratch or damage them which will reduce their collectability and their value.
Don't store them in any plastic or other material that may cause a chemical reaction with the coins and damage the suraface.
The best option is to buy ready made coin storage items of a reputable make or if the make is unknown to buy from a reputable source.
Coin envelopes, albums and display cases are all available at E-Bid, coin fairs, hobby shops, coin dealers shops or via the Internet at reasonable prices.
Using these displays will keep your coins safe and give you a nice way of showing them off to other people.
I have no vested interest in this advice as although I sell coins and banknotes at my E-Bid store I do not sell coin or banknote storage but I do want my customers to have a good experience from coin or banknote collection.
I am sure other advice from other dealers on coin and banknote storage would be welcomed by buyers.