
If you're a numismatist, being a philatelist is not that too far off. I used to collect coins and currency (still do to a very limited degree) but they can quickly run into major $$$. Stamps can too, but one can be selective about which ones to collect, and there are always collections that can be made to fit into one's budget.
I suggest you post a few samples of what you have in stamps and someone on this site is bound to help you identify and/or value them.
Typically, most US stamps from the 1930's to present day do not command any significant worth over face value. There are exceptions, of course. The joy is in acquiring them and mounting them in some acceptable order (and you might get a new history lesson or two in the process.)
I'd start the ball rolling by obtaining a stamp catalog. Scott Catalogs are the most widely acknowledged in the US. If you don't want to invest in purchasing one, I'd suggest you check it out at your local library. If you want a limited sort of catalog,
"The Postal Service Guide to US Stamps" can be purchased at most post offices for about $20. It's not as detailed as true philatelists might prefer, but will give you basic information as to catalog numbers, values, etc., to start up your interest in the hobby.
Check back here at Stamp Collecting Forum often. In simply reading some of the questions and answers from others, you can learn an awful lot of valuable information and insight into a very rewarding hobby.
Enjoy!