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If you look in the "Collectables" section of Half Price Books, there are generally several Coins of the World type of books there that will give you some good information on foreign coins, their scarcity, and/or value, given their apparent condition and such. Most of my foreign coins are of general interest only, such as an Australian penny from 1943 or so that is as big as a Kennedy half dollar. The internet might get you a reasonable idea, if you can identify the coin correctly, put the information into the search box on Ebay and see what pops up. Be advised the coins on there are generally quite overpriced for the value (in my opinion).

Basically, spend a few bucks, buy a coin book that is a year or two old, and do some preliminary work ups from there.

Some may be made of real gold or silver, some may have unique configurations, or be very scarce in many different ways. Always handle them by the edges, don't try to clean any of them. That will depreciate the value. Try not to keep them in a box or bag where they rattle around each other and leave marks. You may get more information from Littleton's. You can find them online. They also sell little cardboard holders that have circular plastic covered openings that you can put the coins in to help keep them from getting banged up. They are inexpensive. Just type in "Littleton's Coins" in your search engine. They should pop up.