Gloria,
Normally, in this part of the world anyway, you do a course of some sort in Sound Engineering / Broadcast Engineering either a B.Sc. or a Diploma. Then it's a case of finding your first job in the area. Often, you'll pick up some kind of work in local radio stations, recording studios etc quite readily if you're enthusiastic and willing to 'muck in'.
I would suggest that you perhaps make contact with one of your local radio stations and ask if it would be possible to e-mail / or phone one of the sound engineers for advice. They're usually quite helpful and keen to talk to people who are genuinely interested in getting into the industry.
You might also be able to get some work experience in the a local station / local studio by offering to do maybe a few hours on a weekend or something like that to gain some experience. You'd also get the low down on how things operate in the industry in your country too.
Also, if there are any community stations, voluntary stations etc in your area, they can be a great place to get some basic experience as everyone is working on a voluntary basis.
