Welcome to CoinTalk Lisa,
A good first step might be to start to inventory what you have. An inexpensive book to assist you would be A Guide Book of United States Coins by RS Yeoman. The 2010 edition is out and you should be able to get a copy for $15 or so. Available on the internet, bookstores, etc. Do keep in mind that the prices noted are somewhat out of date by the time the book gets published.
Using the book you can start a list of what you have. On paper or a text file is good enough. If you have a digital camera the members here can help you by looking at pictures.
With a complete list and the advice from your new friends here at CoinTalk you can get an idea of each item's value.