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As to what chip said. So much depends on what you are trying to find. A selling value, a collection value, insurance value, what?
Naturally first sort out the US coins. Then sort out things like proof sets, raw coins, coins in slabs, etc.
As to all your US coins I would just use the latest edition of the Red Book. Estimate the approxiamate grade, condition, of the coins and see what is listed in that book. Then, since everyone knows those prices are excessive, reduce all your estimates by about 25%.
However, that would be the selling prices if you were to be dealer or try selling on the internet in ebay, for example. If your intentions are to just sell them, most dealers will try to low ball you so you should really know what you have first. Then expect them to offer you about half of what you think they are worth since they must resell them and make a profit to live by.
As for foreign coins as already mentioned try that forum right here.
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