But capeshit comics typically don't have you choose from different iterations. Even when you think they do, they don't. The closest it got was when they rebooted a bunch of characters in the late '50s, like The Flash, Green Lantern, Hawkman, and The Atom. First of all, that would still only be two iterations of each. But then they just established that they're actually legacy characters. Also they're so different from the originals that really they can just be considered different characters with similar concepts. Nobody is getting Jay Garrick confused with Alan Scott.
There are things that are out of continuity, and some of those are really good, but they're typically standalone stories. If you want to read "What If Superman landed in Russia instead of America?" I don't see how you could possibly get that confused with the main continuity.
The main continuity has the crisis events, but they aren't real reboots, they're just cosmic magic shit. Really, Action Comics #1 is still canon. Hell, the bad guy from the cover of Detective Comics #1, which was a over a year before Action Comics #1, came back sort of as a major bad guy in "New Super-Man" like two or three years ago. The end of the arc kinda fizzled out though. But my point is, it is all canon, and people thinking there are a million different iterations are misinformed casuals. That said, people don't recommend reading straight from the beginning just because it's so long, and styles do change over time, so go ahead and start reading all the way from New Fun Comics #1, which is also still canon (though I think the earliest character who still actually gets used sometimes, Doctor Occult, is from New Fun #6), but if you don't like that, you might like some later stuff instead.
Also Marvel doesn't even do that crisis shit. That's pretty much DC only. I suppose there's One More Day, where Spider-Man sold his marriage to the devil, changing history so he was never married, but nobody likes that one. Also, it's not like that means the old issues never happened, just that magic happened later and fucked with history.