Felicxajn studojn! Check out the KernPunkto podcast for themed audio, "Esperanto Variety Show" Youtube channel for vlog audio, and Reddit /r/Esperante for text shorter than a book, and the /r/Esperanto [1] Discord ("Diskordo" in the sidebar) for text chat, and very occasional voice chat, but I suspect other tools are better for that (Amikumu?).
[1] /r/Esperanto is about Esperanto the language, meta-commentary or learning, often discussed in English. /r/Esperante is any topic, where the content is in Esperanto.
I will definitely check out the podcast; at what level do you feel I'll be able to listen to it and understand a reasonable percentage of what they're saying?
I've only been doing the Duolingo course for a little more than a week, and while I have enough grammar to do some very basic sentences, I'm far from fluent.
I don't know how to guess, I'd been learning on and off for a long time before I started listening, and I still can't understand all of it fluently. The things I like about their podcast particularly to recommend it is that it's a lot of content - 30 minutes or more at a time and loads of episodes, of consistently good recording quality, it's two people and sometimes a guest talking quite clearly so it's very regular speed and accents to get used to, and they talk about a topic each time so there's quite a lot of repeated vocabulary during one episode, and it's all talking no cuts to music.
[1] /r/Esperanto is about Esperanto the language, meta-commentary or learning, often discussed in English. /r/Esperante is any topic, where the content is in Esperanto.