Because endless roles are available, the more an actor knows how to do, the wider the variety of auditions you'll be able to attend. For example, learning foreign accents or impressions may appeal to a certain market that was previously unattainable. Some roles may require that actors know how to sing, dance or both. Taking classes and practicing different skills can help actors prepare to play a variety of different characters and more options on the job market. Many actors also start by participating in community theater productions. Others may choose to perform publicly at 'open mic' nights held by local venues. Performing in other public settings, such as nightclubs or dinner theaters, can also help beginners get real world experience and help them become comfortable in front of an audience.
Break a Leg Dante
Doc recommends the following next steps:
I would think long and hard about why you want to be an actor - I used to constantly think about being an actor because I thought that fame would make me feel loved (if I was being really honest with myself) and I think somewhere in my mind I thought it would allow me to feel better, acting out my emotions and fantasies, but the reality is, most of these "fantasies" tend to promote bad morality in our world - pride, violence, mockery, lying, lust, greed, anger, vengeance, risk-taking, perversion, drugs and alcohol, none of which are part of being a nice person. As I look at actors as an adult, I see people who for the most part have lives that I wouldn't like to have. There is a constant pressure to be perfect in the eyes of the public and a constant state of anxiety in these folks knowing that they could never live up to that pressure, people who jump from relationship to relationship leaving destruction in the wake, including kids and exes. Only God can hold the weight of our need to follow Him - we can't do it for ourselves and we can't find it in famous actors/ musicians, and only His love will make us feel whole - not the admiration of people. It's part of why actors/ musicians work and work and seek and nothing fulfills.
I know my answer won't be the popular one, but it is the truth. We weren't made to be "famous" - we were made to worship God and let Him be famous/ glorious.
I hope this helps you.
For actors, the body expressions, the way you talk, how you act feelings can be improved by teachers feedback, with some psychology behind how people perceives body language and so on.
While, as John said, this a domain when innate abilities work well, you can always improve them with some academical backup and improve them by knowing related topics.
Never under-estimate the power of knowledge.