welcome to the stamp comunity, CaPpedDoG!

The standard reference in the US for stamp values is Scott's Catalogues.
They are in seven volumes and the set is available in most public libraries.
A new set is expensive, but you can get a set of used copies (which are 4-5 years old) for about $35-50 on
ebay.
I have to get going to work now. I can check the value of your stamps tonight if no one else has by then.