There are so many ways to give advice about how to start. There are many ways to look at how one begins. A lot of it depends on your personality and how one deals with the unknown. Having said that, here are some thoughts to encourage and support you in this wonderful world of voiceovers. Do not over estimate everyone else's intelligence. I tweeted last week that an old time voiceover guy told me when I was 22 years old and nervous about trying to get into voiceovers, " People dumber than you are making a fortune, just get out there and do it."
Never worry about what everyone else is doing or what "the odds are" it's completely besides the point. The question is do you love it enough to develop a great set of reading skills and start doing it. Training is the first and most important place to start. No one on a job is there to run a trade school. You have to know what you're doing. It's been my experience that a lot of people seem more interested in how to network than they are in developing the skills necessary to be hired and then re hired because they've done a good job. Learn the trade and whats required. Develop your skills so you know what you're doing. Be good company on the job and always, always be on time/ deliver on time and a voiceover career will treat you very well.