There's a list of five things that I believe make a video great, in order of importance sound is probably at the top of that list. But it's not as easy as asking your favourite Facebook group for recommendations, there's a good chance you'll end up with something that won't work for you. Because, mics? Not all microphones are made equally ... or suited to every environment or voice.
Thing number 193 that no one tells you: not all video cameras are created equally. The money's in the lenses (and therefore most of the cost). Pro is not required. And other stuff you should probably know before you drop a wad of cash on something that you may not even need.