I have a channel. I dont go live or anything.
I dont know anything for certain about going live.

I suggest using a decent condensor mic and a digital interface.
In the economical range, I suggest Rode mics and the Focusrite by Scartlett.

If I was just going to plug in a computer mic, I would go to MICROCENTER or FRYS (if in your area) and see what they had.