There is a thread about anesthesia here:
http://www.yorkietalk.com/forums/die...-protocol.html
I think it is very important to ask some questions (will bloodwork be done, what anesthesia is used for maintenance, are fluids given, etc.). It is impossible and extreme to ask all questions relating to surgery because there are so many things that go into it. So trust in your vet really comes in here.
Preanesthetic drugs and pain meds can be controversial. propofol for induction and Iso or Sevo for maintenance is generally a very good start. Sometimes preanesthetic drugs are given to lessen the need for general anesthesia, balance things out to lessen potential side effects, and help with recovery (smoother recovery equals more pleasurable experience for pet). It can make rhe procedure safer. It depends on the vet, what is being done, etc. There are many acceptable protocols for this. Pre and perioperative pain management is a good thing. There are several good pain drugs. The best one is the one that your vet believes your pet will do the best with. Some sedate more than relieve pain which is not always helpful for rhe pup. I like nsaids, tramadol, and sometimes buprenorphine, etc. depending on the case. A lot is based on medical history, pain of surgery, size of pup...