No, cause then they look older
Ebay can be a good place to sell coins. If you don't want to do that take it to a coin collector.
yes
because they dont want you to get your coins back
You should sell things that you want to sell. If you want a lot of money sell something valuable that someone would want. Try eBay or craigslist.
you have to play some of the games and sell some of the stuff you don't want.
Try www.greatuscoins.com/ . They sell collectible coins. You may also want to try ebay. You will find many coins there.
Never clean old coins, pennies, nickels, dimes, etc... Coin collectors want the natural patina. If the pennies have dirt on them then soak them in water to remove the dirt. But don't use any detergents. Detergents can damage the surface of the coin and leave pitting lowering the value of the coin. Also do not rub the coins together to loosen the dirt, this can scratch and wear the coins and lower the value. Coins (US Coins) will be worth face value to a non-coin collector, but if you plan to collect coins or just clean them to sell as collector pieces, then don't clean them.
if you want to
Clean out some of your things u don't want & have a garage sale or sell them in eBay
Depends on how many you have and how many you want to sell.
It depends on the type of foreign coins. If you have a rare coin and want to donate it to charity, it would most likely be best for you to sell the coin and then give the money to them because far too often charities don't understand how much those coins are worth and will sell them for very low prices. If they are common coins, you might want to try thrift shops and such. However, what I would suggest if there isn't a charity that you for sure want the coins to go to, would be to give it to a child who shows interest in coin collecting. Even foreign coins that are essentially worthless will spark a kid's interest and imagination.
You can get more coins by going to work every 5 hours or you can earn up to 200 coins a day from other users by playing games or if you have stuff you don't want sell it to other people.