If you want to get a sort of general overview of what you have (and can identify the coins), you could make a list of the pieces without pictures: Country, face value, year. We might then be able to tell you that this or that coin has a value of, say, "between 50 cents and 50 dollars". This way you would at least know that the coin in question is not some extremely rare piece which is worth thousands of $$.

For more detailed info you would have to know what condition the coin is in. The same type of coin can be worth hardly anything (if well circulated) or quite a lot (in excellent condition). That is where photos help a lot. And, of course, if you stumble upon coins that you cannot identify.
If you actually have a bunch of coins, try and follow Brett's advice - get that World Coins catalog. Maybe your local library has it, or can get it from another library. And even though it usually is a good idea to use the most recent edition of such a catalog, for an overview you don't really need the newest one ...
Christian