Actor Beware
Unfortunately, there are many scams geared toward vulnerable beginning actors. In larger cities, you're more prone to find scam agencies or management companies that offer representation for a fee. Remember: You should never have to pay for representation. Ever. A good agent or manager earns his/her pay by finding you work and taking a percentage (usually 10%) of your earnings for that project. The only thing that you should be spending is your time on developing your craft. Any agent worth his/her salt will recognize that when s/he sees you.
Actor Beware, Take 2
Watch out for a potential agent or manager who demands that you go to a certain photographer to have headshots taken before s/he will represent you. Certainly it makes sense that an agent will have a suggestion or two of good photographers who have done well for their clients in the past. The giveaway is if your signing with that manager or agent hinges on whether or not you use his/her suggested photographer. Do not give into the pressure if you have another photographer in mind or even if you want to do some of your own research. Your agent shouldn't care as long as you look your best in your photos!