Short answer - I'm not going to pen a tutorial or do a video. You need to search YouTube and see how folks have done it - there are a lot of different ways, and maybe one or the other makes more sense to you.
If live streaming is your only focus, then I'd look for a mixer with USB connection and see if you can find videos of folks describing how they used that for live streaming.
If you want to record as well as live stream, then an interface with built-in FX or the ability to download them might be a better option, but it introduces more complexity. I have a Steinberg model that has this capability, and they may be the lowest cost with that feature. I used it exactly once with the built-in DSP (a little reverb and compression) as a proof of concept for live streaming using the computer webcam. It works, but the tradeoff is that since it's primarily an audio interface, the control of the FX is another piece of software you have to use on your computer (no phone version) so, e.g., if you want to stream with a phone, you have to first connect the computer to set the FX, then connect the phone.
If you want to have better video than a computer webcam, a newer smartphone is your best option, so then you have to insure your audio capture device can connect.
If you are planning to use a camera other than the one built into the device you are streaming from, e.g., plug in a DSLR for the video and connect it through a "capture card" to the computer, with the sound going through either a mixer and/or audio interface, you will need an additional bit of software like OBS. I have fiddled around with that, and this is another level of stuff to fool with. (Way up there on the list of reasons I decided live streaming was not something I was interested in.)