I collected stamps for several years and sold some on ebay, so I might be able to help. The information above is correct. U.S. Stamps post 1930 are rarely worth much more than face value. Even the ones from 1900-1930 only have value if they are unused. And while all unused 19th century stamps have some premium value, used ones often aren't worth very much either (although there are always rare ones).
Now you didn't say if these were only from the U.S., and worldwide stamps demand a great deal of knowledge. Anyway, try to find out some more about them and we'll try to help you.
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