Hello and welcome to OF! Before spending big 💵💴💶💷 on those big books, just start here !!
1.
https://omegaforums.net/threads/learn-how-to-fish.52603/ Overall approach to assessing vintage watch
2.
https://omegaforums.net/threads/rec...-watches-only-on-ebay-not-for-inquiries.1790/ Read this daily to see vetted listings and can see realized prices on EB get sense of value
3. Look at threads that say " Show me your (Constellation) (Seamaster) etc", or any other thread that summarizes a particular watch as there are lots of good examples and research info there
4. Rather than trying to learn everything at once, pick out one or two references that you like, and research the 💩 out of them so you know how they should look, movements, cases, dials
5. Read the threads asking about watch assessments from new members who just inherited watch from (Dad, Mom, Grampa, Uncle etc) they are interesting and you also see what are often redialed or fake watches which is good to know about
6. Learn to use the Advanced Search tool in OF it is very good- use it when you see something you like it will unearth a treasure trove of pearls of knowledge
7. Don't buy anything without asking here first! Too many new members pay a hefty "noob tax" by buying first and asking later. Not required!!
Stick around you will learn even without trying too hard. Plenty of further (perhaps some unwanted?) advice will follow.