Newb questions (card protection)

Back in my day we never had game used or auto cards

Can anyone give me a run down on cases sizes I need to buy for these different cards ?

Also is eBay the best option to get a bulk lot of this sort of stuff (ultra pro if they still make them) for restarting the hobby?

Hi Leigh, depending on where you are in Melbourne I suggest getting supplies from Cherry Collectables (can be found on here) or go visit Malcolm at the Dandenong markets