@cocoqs, you said in your OP on another forum (one of your links) that you have neither the experience nor the skills to dance, sing, or act; but it is what you dream of doing. If you read through the threads in this MT forum, you’ll realize that MT is incredibly competitive, both for getting into school, and for getting paying jobs. VERY competitive. More competitive than getting into an Ivy League school.
I guess my first inclination would be to get assessed by unbiased professionals. Maybe you have the raw talent necessary to make it. There is a company called Stagelighter that will assess audition tapes for a very reasonable price. Google them. Second, it seems to me that if you want to make a living acting, dancing and singing, chances are you will need real training. Community theatres do not pay you (if they did, they would be a professional theatres), and hence, you could not make a living doing that. Training either involves piecemealing together training (acting, singing and dancing lessons), or going to a 2 year program (like Cap 21, AMDA, CITS, etc.), or going back to school for a BFA/BA in musical theatre. I’m not sure where you live, but that may be important as to the quality of the training you can get. Third, if you assessed yourself fairly, and you don’t have the skills to act, sing, or dance, you have a very long and tough road ahead of you. Maybe you should think about becoming involved in theatre in a different way, either behind the scenes, or in an administrative capacity. Your art skills may enable you to help out with sets or props, for example.
You say, “Other than role-playing when I was a kid, taking one dance class, writing a short script for English class in elementary, and amateur singing in my room, I don’t have any experience.” The bottom line is that unless you are one of those rare people who has raw talent with virtually no training, it’s going to be a long time before you can gain the skills necessary to compete in this uber-competitive world. But if it truly is the only thing you can see yourself doing, then get an unbiased professional opinion as to what you need to forge ahead (and when I say “professional opinion,” I don’t mean friends, relatives, the community theatre director down the road, or the local singing teacher - I mean professionals in the business, preferably in NY). I don’t mean to be a naysayer, but I want to impress upon you how very difficult this field is, so you don’t think it will be easy to do this. Best of luck to you.