That collection of wheels will probably keep you supplied for some time before needing more. The paper on the wheels is important, not only for safety but also for being able to determine what wheel it is. As the other members have posted, you need to have a ready reference of the grading system used for abrasives. Perhaps print out a sheet and tack it to the wall next to the grinder. I would sort the wheels by whether they have the blotter paper on both sides or not, those that do not will have to be graded when you can tell by looking at the grit/grain, those are unknown and shouldn't be used on critical work until you know how they behave. You also don't want to run any wheel that doesn't have the paper on both sides, not a safe habit. Sort the others according to grit and keep the diamond wheels stored until you need them, they're expensive. All the Al-Ox, carborundum, and cut-off wheels should be handled carefully as they're somewhat fragile. The suggestion to "ring" them all should be regarded as more than just a suggestion. You don't know how they've been handled prior to your ownership and rough handling can lead to a crack/fracture in the wheel. When a wheel gets up to speed or in the middle of a grind the fracture can lead to the wheel exploding, it's a scary thing that gives no warning and can throw chunks right through you. Story from years ago in the same industrial district I worked in was a jig grinder hand came to work, fired up the jig grinder to warm it up to operating temps just like he did every day. The stone wheel had a micro crack in it, exploded, and threw a small chunk of the wheel into his chest. He supposedly was dead before he hit the ground, didn't even finish his first cup of coffee. On a personal note, I have just barely grazed a wheel during set-up, work removal, dressing, etc. and worn the wheel profile in my flesh on more occasions than I'd care to tell. Grinding is not a casual learning curve so do establish safe habits. Can't speak for T&C grinders but the surface grinders have more than a few traps awaiting the unwary. It would be best, as suggested, if you could gain from the experience of someone that's been grinding for years. If that's not possible then reading and asking questions here will pay dividends. Sure you can learn on your own but the first time an expensive piece flies off the chuck (Houston we're launching D-2) and gets ruined you'll hope nobody else was witness to the atrocity. Oh yeah, you'll need to do something about dust control from grinding. You really don't want to be breathing in the copious amounts of particles that grinding generates.
