Exposure isn't easy, and starts slow, unless you have something to get a lot of people to watch it, who would also like watching more of your content. From a viewer's stand point, what's different about your content will be a reason to continue watching. Then, you need to find a way to show those people that you are doing those kinds of videos.
Making money through YouTube ads isn't something you should expect, because it takes a LOT of views and people watching longer content to get it to pay decently. That said, there are other ways to make money with YouTube, if you jump through the hoops, do the paperwork and manage it. They still require plenty of views to make much money though. That's not to discourage you, just telling you the truth. That's why a lot of the big names either set out to have fun making videos, and thus people have fun watching them play, or set out to create a specific kind of video content and work hard to make it good.
As for voice, age, experience and technique all contribute to it. Just a moment ago I wrote a more thorough answer to somebody else on this forum asking about how to improve their speaking voice, so here's the link to that discussion: http://www.minecraftforum.net/forums/show-your-creation/video-series-help/lets-plays-help/2597974-ways-to-improve-my-lets-play-voice
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Corrupted chunk possibly?
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I'm the lowest rank of staff on the IP in my signature, and sometimes once or twice in 2 weeks I get msgs saying "plz can i have opz i wil r0llback my tr0lling" Annoys me to heck.
My msgs: 1. Why do I even care about your trolling? 2. No one gets op. 3. I can't give op and why would I?
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The map will be called The Infection, and it involves testificates