classes in Los Angeles vary from professionals doing a semester
of classes, to established studios who let you have a free trial
class, to businesses offering screen and stage acting.
There are many to choose from
and it's always good to be wary and cautious until you find one
where your gut says that's where you belong.
Some advertise how long they
have been in business including The Actors Workshop (since the
1970s). This workshop provides beginning and advanced
classes and also offers audition techniques, cold readings, and
on-camera scene work.
Here are some websites:
Acting Classes Directory