Do extensive research on the craft of acting, then begin to do school plays and or/ musicals. From there, try to grab all the jobs that come your way. As soon as you have some extensive amount of work (at least 20 credits for a child, a little more for an adult), I would suggest looking into creating a demo reel, acting resume, and getting a decent headshot from a recommended and reputable photographer. From there, try going on castings calls. Additionally, I would greatly suggest getting an agent. As soon as you start getting much jobs booked from your agent, try looking into getting an "A" (UTA, ICM, WME, CAA), or "B" (Gersh, Paradigm, Osbrink, CESD, Abrams Artist, Innovative Artists) agent. These "A" and "B" agencies will help you get bigger job in motion pictures as leading and supporting roles. As soon as you begin getting these sort of jobs, I would recommend getting a manager. Also, a media & entertainment attorney would help you greatly. They will help you with figuring out what the offered contracts do, whether or not the company is legitimate, etc. This is what most actors try to achieve. These steps that many actors try to get up to. Even though this may seem as an easy plan to follow, it isn't. Never give up.
Believe in what you are doing
I'm just starting off as well sort of but I would say never give up, be strong know what you want and go after it fully.
Study, study, study, research, research, research, and prepare yourself for the journey you are about to embark on. It is not an easy road, but if this is all you have in your heart, you can make it.
It may sound trite, but be sure you're acting for the right reasons. You can have a wonderful career as an actor and make a handsome living doing it, but you may never reach the level notoriety or fame as some of your peers or idols. So long as you feel comfortable with that possibility, be free, and don't be discouraged or ashamed if at times you feel yourself falling out of love with the job; you're not alone! Auditioning is a hard knock and there are times you'll feel like you're circling the drain, and that's where hobbies come in handy.
You're going to need to audition a hundred times before you get your first role. That's not necessarily literally true, but the fact is that acting is a hard job and you will undoubtedly face more rejection than success, but also remember that the ratio of rejection to success makes landing a role all that much sweeter. Also, you may be rejected, but you never fail, you are never a "failure", you just weren't right for the part.
The same advice I was given: It's a marathon not a sprint.
I'm somewhat just starting out. I'm still taking advise.
don't do it,.......Lol
Keep a light heart, be positive and keep working on yourself and the craft of acting.
Don't wait for someone else to say "yes" to you or give you an opportunity. Create your own and work on those when auditions aren't coming or nothing else is happening. It keeps you in that creative space and helps prevent burnout or frustration from building.
Get used to rejection.
Take it all!