So, SAG actors have minimum rates, but can I negotiate other terms?
Yes. Just not lower terms. SAG has a minimum pay requirement - you
cannot pay less than that minimum.
my case principal shooting will take place in Georgia, and traveling with business class could cost much more than what they get paid. Is it negotiable at all?
No. Travel, lodging and per diem minimums are not negotiable. You
can offer better - you cannot offer less.
Also, how the process work, should I approach SAG for casting, or should I cast myself, and then if I choose SAG then contact SAG? or is it the other way around?
SAG does not do any casting nor do they help you with casting. If
you want to hire guild actors then you will contact SAG first,
sign an agreement with them agreeing to follow all their
requirements and then you will cast your actors.
Gonzo is correct, there are no requirements other than being
eligible. Really bad, very unprofessional people can (and do) join
SAG. Talent is not a requirement. You will find actors in SAG that
you will not think are talented. That’s why you hold auditions.
But, what is the reason to go with Union if it is only papers and nothing else? Also if I have cash what is the reason, benefit of using unions.
In many cases there is no reason at all to use guild actors. As
Gonzo said, if there is a specific actor you want to use and that
actor is a member then you must work under the guild requirements.
In the rare cases that you do have a contract issue with an actor
you have very clear wording that you can hold them too. Something
you may not have using non guild talent. SAG will help a producer
enforce their contract. On the other hand, they will fight on the side
of their member if the producer violates a contract term.
This brings up an interesting question... labor unions require their users continue their training and education in their field as an offset to the increased cost of using union labor... what is our incentive to using union labor on our set if this isn't a requirement in this field?
SAG is not a trade or craft union. It is a Guild. And you have
pointed out the primary difference. A guild is in place to enforce
working conditions and pay scales, they do not require any skills
or training.