Well.. a good PC to make quality videos ist the basic requirement. In addition to that a microphone. Doesn't haven't to be a 200$+ Mic Using a Snowball myself and I'm pretty satisfied with the results.
A Mixer or whatever some people are using is not nearly worth the price compared to the gain...
There are only positive things in building an own PC.
Pre-Built PCs are mostly highly overpriced.
If you don't have the abilities (or trust in your abilities) of building it together just look for a good PC store. Some charge a little fee for building, some don't.
Hm.. I see the youtube channel as a good way to interact and connect with other people. As a Game's YouTuber it's also a great way to play some old games and not even slightly consider it a time waste. Plus when I can entertain other people with the videos my Job's done right.
My Name's Chris. I'm 25 Years old and from the wonderful Austria (Austria, not Australia, we don't have any Kangaroos here! :p ). I recently started a new YouTube Project, because I want to make some english content aside my german YouTube Channel aswell.
When I'm not sitting...