You start by getting quality training from well respected instructors. (That pretty much continues throughout any career you attempt. Not only does it improve your acting skills, but it's one way to network in the industry.) You'll need experience - community theater is a good place to start.
Then you can see if acting really is all that you thought it would be. You also research and learn the business end of things. There's a lot more involved in an acting career then getting an agent and going on auditions.
It's like running a company and you are the product to be marketed and sold. You need to understand contracts, unions, legal requirements/taxes, effective marketing strategies, networking and the like. There are a lot of scams and rip offs out there, so educate yourself to protect yourself.
So read industry trades and websites like http://www.backstage.com/advice-for-acto... . Read books about the business end of the industry. (Brian O'Neil has a good one as does Bonnie Gillespie.) Talk to work actors in your area about what is involved in their career.
Do some self reflection - can you handle the competition? You'll be rejected far more then accepted and you'll need to remain hopeful. Can you handle the instability?
Every acting job is temporary, so you always have to worry about when/if you'll get another acting job. Do you have a way to support yourself that will give you the flexibility needed to attempt an acting career? Do you have realistic goals about the type of actor you want to be, what acting you want to do and how you want to approach your career?
If you're just hoping to be discovered, that's not going to happen. (Sorry.) It's easier to start a stage career without an agent - so that's what you can check into. Once you get quality training and experience - research and find a good head shot photographer.
Then investigate what professional theaters are there in your area? How can you submit your head shot and resume to them/when do they have auditions? Equity is the union for stage actors - so make sure you understand about Equity contracts and the like.
Some professional theaters will only audition Equity actors. And remember - you can always have acting as part of your life, even if you don't pursue a professional career. Community theater and even your own acting projects can be a creative outlet for you.
Good luck.
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