The only thing they send out prior to training is the benefits info, PRIA, and some other things that deal strictly with you basic employement (like almost any job) No training material is sent out prior to employement, but you should still come with the basic knowledge that you have acquired as a pilot. Don't attempt to get any material on the aircraft you are flying as each company has their own set of procedures and so forth, and you may end up studying the wrong model/limitations/etc.