Here's something good that has come from the whole coronavirus mess -- the archives of Baseball Digest have been made available to everyone for free. I saw this in the newspaper yesterday and signed up immediately. I could spend days down this rabbit hole.
Renata Galasso had full page ads in just about every baseball-type magazine. I bought a complete set from them in 1979.
The year before, I bought my very first complete set from GS Gallery.
I had this card box and had all my cards dutifully collated by teams.
I strongly suggest you take some time, go to https://baseballdigest.com/, get a free accoun, and browse the archives.