My son has acquired a good amount of Pokémon Cards at Christmastime. I have a question.

So my son has acquired a fair amount of Pokémon Cards as a Christmas gift this past year. They were bought second hand from a place like Goodwill. I have two questions:

1: What’s the best way to organize them? Binder with card sleeves (this is what I did with mine when I had them in the late 90/2000s)?

2: What is the best way to organize them in the binder, if I go that route?

I’m not big into this like I used to be so I’m a bit overwhelmed with all of the cards he has and don’t know where to start, lol.