I  am a new provider  and I have a few reviews for the last month . I recieved an email from a adult model mangement company in the San Fernando CA saying  something like I am what they are looking for , they asked if I am interested and send additional picture and phone number . The email seems legitim and the webpage and facebook page too.  
It is that common for providers to recieve this kind of emails?  
Actually I am really really interested but I am not sure if I will reply that email  , where or how can I do casting for that?? I am not American , I am here with a student visa , it's that a problem if I would like to do porn? I am 23 years old , its too late to begin?

They are a very big rep firm for porn actresses.  Good luck!
ladirectmodels.com

I have been with LA Direct since my first trip to Los Angeles. They have been great in my own personal experience. If you are serious about getting into adult,  I would at least contact them so they can give you an honest assessment of the work they can get you. You will get work the first few weeks if you are new regardless of who you go with, but a good agent will keep finding you work when you are no longer "fresh off the bus".  

Send me a PM for more information.

If not LA Direct, also consider contacting OC Modeling, ATMLA, or Type 9 models. Before you pick one, get everything in writing.

I find this a bit amusing, because advising a new girl to hook up with LA Direct is the last advice I would give to someone looking to get into the industry.  

Sure detective, we can point you in the right direction to where to begin busting the bigwigs.