>>50447971reaper plug-ins are the only thing i used when i had a worse mic. Since i upgraded to the sm7b and soundtreated my streaming setup I didn't really need them anymore. Generally improving your raw input is always going to be way better than post-processing an already impure signal.
But this site has a good summary of what the various things do and how to use them:
https://streamershaven.blog/creator-tools/vst-plugins/the-best-free-vst-plugins-for-creators/These are used by a ton of streamers and at least the noise gate helps smoothen things out a little bit with cheaper mics or a sub-optimal setup. Stuff like limiters are useful when you like to scream a lot, doubt you don't seem like the type of guy to do that.
>>50448084OBS allows you to add audio captures now and as seen at the top you can assign a "track" to them where they are going to be heard. Then you can select any of the tracks to be included or excluded in the twitch VOD (previous post's picrel) and there you go, a proper split of your audio sources. Honestly I haven't tried this myself, so I might be wrong on some things here if you are really interested just check out one of the many vids.