Hi  @tomsaber ! Welcome to stamp collectors. This is a good place to learn more about philately and ask questions. Other good resources would joining a stamp collecting group on Facebook.

My group U.S. Stamp Shop sells 75 stamp lots each week, so its a good place to see how much stamps are being sold for based on their rarity and condition. 

You can also monitor and watch what sells on ebay. Just be sure to look at finished listings that actually sold, and NOT what people are asking for a stamp. 

And finally YouTube is a good place to learn more about stamp collecting. My channel is @ThatStampGuy