There are no such things as "talent scouts" who go around looking for people to turn into stars. Justin Bieber's case is a fluke. There are literally millions of kids who post videos on YouTube thinking they'll be "discovered" and become celebrities, but that's not how the industry works.
Unless you already have business to manage, you certainly won't be able to find a manager (or afford to pay one, since entertainment managers are generally lawyers) who'll work with you. And managers don't have anything to do with the daily business of their clients. Their job is to look out for their clients' best interests during contractual dealings.
Unless you're on the verge of signing a record contract, you have no need for the services of a manager. You don't need to think about management until record companies are calling you. People in the music industry don't even need agents, since they can book their own shows directly through club owners.
But if you don't have original music and musical accompaniment, I think you'll have a hard time finding places to perform. The only place where people can sing other people's songs to prerecorded music is a karaoke bar, and you won't be able to launch a music career from there. Clubs that feature live music are looking for full bands, since no one will pay a cover charge to hear karaoke.
People don't "go to record labels" so much as record labels go to them. The only way to generate record company interest is to perform regularly and build a huge and expanding fan base, since that will prove you can sell your music to the masses. Record labels are in the business of making money, so they don't particularly care whether or not the acts they sign are talented.
The world is filled with brilliant musicians who'll never land record contracts because they can't attract big crowds. But there are lots of terrible singers and musicians who make fortunes because they've got crowd appeal. Record labels have A&R (artists and repertoire) people whose job is to keep track of live music scenes and report back about acts that are generating a lot of interest.
To get onto the radar of the A&R people, you'll need to have original music and be able to attract big audiences every time you perform. It's also likely you'll need to break out of your local music scene, too, and prove that your music can sell in another market, as well. That's why people in music usually have a few cities where they play regularly -- to build their fan bases and broaden their horizons.
It doesn't matter where you live, since there are A&R people all over the world. I've had friends in Georgia, Michigan, Ohio and Oregon who signed major record label contracts after several years of playing college towns within a 200-mile radius of their hometowns. Basically, if you're big enough to get signed, the record companies will already know who you are.
And if record companies aren't coming to you, that means you're not doing well enough to get signed. You need to get out there and perform before you'll have any chance of a career in music. As much as people think the digital age has changed things, the music industry still operates very much as it has for decades.
Every generation has a Justin Bieber -- someone who never followed the traditional path, but got to the top, anyway. You have a lot better chance of becoming the Queen of England than you do of being plucked from obscurity and landing on the red carpet, since there are literally millions of people who have the same dream as you do. And record companies are only going to give serious consideration to the ones who've gone to the trouble of creating their music, perfecting their live shows over months and years, and demonstrated that they've got something that can generate a lot of money for everyone involved.
Music is and will always be a very do-it-yourself business.
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