Icons?

[quailfence]

So, I’m familiar with the purpose of icons, and the fact that you can have more than one. My question: where are some good places to find icons? And if one were to post icons (whether to their personal journal or a community), what are some norms/expectations/etc? (For a bit of additional context, I’m looking for some icons for Amphibia and a few comics (web, book, and strip) to use on here, and I’d also like to post some icons that I made prior to joining here)