Honestly, it is best to already know how to act before you try to take classes at a casting directors office. They make thier minds up early and fast, not leaving you the time you need to develop your skills proficiently. Once you know what you are doing, then you can take an inexpensive class from them to introduce them to your skills.
I am excited about winning the lottery. I know you are too. However it is always good to have an alternate plan. Some people think acting as a career is a little like winning the lottery. Let me tell you now, it is not. Acting is a craft that you can learn. It is fun, and when you are working it is a little like working at Disneyland. Only in that way would you really compare it to winning the lottery. Commitment and passion for the craft is what makes Acting as a career really work.