Dont buy anything yet …!
Go to a coin show, a decent coin show with 20 or 30 dealers is a good start. Anything bigger than that will be overwhelming.
At the show flip thru all the binders and dig thru the bins and talk to dealers .
Get a feel for whats available and what you like and what you should pay. Take notes, take pictures, write down prices, compare prices. The same coin can vary in price from one dealer to the next by 200+%.
(Graded coins are fine, but you already have binders with 2x2s? Stick with those for now.)
After a couple shows you'll know what you like but start small. With $30 -$50 you can buy uncirculated world coins including some modern silver, or fill your binder with a date-run of BU Wheats from the 1940s and 50s. Or just grab one or two nice Franklin half dollars every other month. Those are affordable even in UNC condition. You might not know what you like till you see it all laid out in front of you.
If you need help picking a coin show, repy here with the nearest major city to you. We dont need your address but give us an idea of where you live and we can suggest good shows.
PS: important rules: always stay in your budget, buy the coin not the holder, it's ok to walk away empty-handed!