When you say 'voice acting' what precise market are you aiming for? The market for singing vocals – even backing vocals – is so oversubscribed that chance has a remarkable influence on the results. Not a good situation, if you're actually any good; people are paying to sing.
Most of the dubbing work goes to a rather small number of people who are known to be competent, many 'discovered' when they were doing ADR work on their own films. Which leaves what?
Radio drama; almost all the participants come out of drama schools. It's almost a union.
And (in Europe, at least) it's a small, badly paying market (but great fun).
Audiobooks; growing demand, contracts for best sellers normally go to known voices, television, some radio, some live theatre. Very complicated to set up as large numbers of different organisations have their finger in the pie.
Radio commercials for non-syndicated local stations.
Hospital and community radio - normally volunteer rather than paid, but can make contacts or gain experience.
Live performance; obviously still (or again) the principal showcase for musical skills.
Web announcements; every site I can think of with audio content is so amateurish with voiceovers this is a potential 'foot in the door' situation; but there's a sort of- 'anti-snobbery', do everything for free 'cause like this is the web- attitude to overcome.
I'd suggest contacting a couple of local recording studios – hey, we're not all ogres, even if we do have to explain to huge numbers of aspiring young musicians that, despite what their family's told them they do not have what it takes to survive on talent alone – and maybe some local TV stations. Don't be pushy, do be interested, and you can get lots of information about your local scene that I, on the other side of the planet, have no access to.