Most people share such an idea that acting may seem easy. Often enough actors don't get the part because they lack the training and experience; they should go to some acting schools. There are many acting schools and classes that specialize in different entertainment fields such as commercial acting, printwork, runway modeling,etc. Decide on what it is you're best suited for and most interested in, and focus your training on that. Great training may cost a substantial amount of money, however it will play an important part in reaching your goals. Be careful in your selections because there are many frauds. Always check references & credentials. Acting schools abound in metropolitan areas, but particularly in Los Angeles will you find more schools than you could visit in a lifetime. Often, the teachers are former actors who never went as far as they had hoped on the silver screen, so they dropped out in order to teach other actors how to act as poorly as they had been taught. This, you may correctly deduce, results in more mediocre actors who will rarely, if ever, find industry work.
Other actors recognized after making a few films that they no longer enjoyed seeing their name roll past on film credits. They knew how to act in the acting schools; they were good at it, and found they derived greater pleasure teaching others the craft they had learned than in performing it themselves.