
Welcome to Stamp Community Forum, Jarrid!
You can drop by or call your public library and ask if they have a Scott stamp catalog, either for check out or on reference. The US stamps will be in Volume 1.

You can also post some pics here, and I'm sure someone will be more than happy to either ID some stamps or point you in the right direction in the catalog.
Quote:
a certificate of authenticity from the US Postal Service
USPS did not issue such certificates. It's probably a "certificate" from some company like the Postal Commemorative Society made to look like something "official". There's always a company that tries to sell things through mimicry

instead of on its own merits.
I happen to like the replica FDCs, and have a couple in my collection -- even though you will meet some collectors who won't hesitate to trash talk those items. I think they are pretty. But as Harry noted, they usually don't sell well to seasoned stamp collectors.
Just remember -- the best way to enjoy stamp collecting is to collect what you want the way you want. While it's nice to learn and get advice from other collectors, don't feel compelled to follow our "rules".
Once again, welcome, and hope you will drop by and post often!

Kim