Facebook has local acting resource groups in most cities. They are usually independently moderated. There are also auditions on Craigslist under "Talent" and "Gigs". Most pro auditions should be held in commercial spaces. Always be careful when answering a casting call and try to bring another person if possible. It can't hurt to contact talent agencies to find out what they require to represent you. It can range everywhere from an extensive film demo reel to a simple monologue performed in their office. Good luck. I think acting is the best "job" in the world and I wish you a ton of success.