Your old coins and sliver certificate are definitely worth some money. But, how much possible money value cannot be determined here unless they can be viewed in hand.
What they are worth greatly depends on the condition of them. This is determined by a U.S. Coin Grading Numeric Scale. The grading scale is available on the following site.
US Coin Grading
After determining the possible conditions of your coins based upon the grading scale, you can then go to sites such as
PCGS Price Guide and
eCoinPrices Current Coin Market Values At those sites you can get a rough idea about the possible value of your coins.
For the silver certificate, you might try the following site:
Ron's Paper Money FAQ
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