Hello stillnesssage, welcome to Stamp community!

There are a lot of new resources on the internet, that you can save or print off in black and white or colour, perhaps evena t a library if available.
Different countries have some own special web sites, either official or voluntary.
Catalogues are available somewhat only online, as people have actually accessed the actual real stamps.
New countries can be searched for on Google or Stamp Community here for discussions and or inclusions in standard paper catalogues like Scott or other countries world catalogues.
The German made Michel catalogue system has been recently refernced as a very good world wide resource to have, albeit not always in English, although I have no personal knowledge of it.
Scott id generally a good reference but lacks listings of some stamps from countries whose postal use is in question, the catalogue people themselves seemingly needing to have to have access to postal material themselves to prove this perhaps.
There could be some countries that are indeed not real countries at all but made up imaginary countries, and still fun and axciting to collect.
Any questions?