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To start, find your foundation for your singing interest. Are you singing country? Is it a rock band you are forming? Decide, be flexible to change, but understand your direction.
Now, with your friends, start practicing. Get a setlist of twelve songs ready and practice on each.
Soon, you can start finding where they have live shows in your genre locally and reach out to the promoter or venue representative and start to perform live.
This is when you build your network and experience, and you continually grow in following and leverage (leverage = being able to perform at the shows that you want to, and get paid more progressively).
It takes a lot of time, patience and work, but keep at it!
I recommend this book as well. Its for managers, but until you start playing shows regularly and getting paid you wouldn't need a manager. Have everyone involved give it a read: http://www.amazon.com/Artist-Management-Music-Business-Allen/dp/0240815017/ref=sr_1_1?ie=UTF8&qid=1383484883&sr=8-1&keywords=Artist+Management+for+the+Music+Business