Hm. I find it strange that your vet actually encouraged you to breed, champion lines or not. If both parent dogs are actually proven showring champions as well as the stud she was bred to and she's of show quality then there's really no "ethical" or "negative" foul here other than not fully knowing what you're doing :P.
I think once the ***** starts producing milk it's only a matter of days. Why don't you want to call the breeder? Did you sign a no breeding contract? If you did you may not be able to legally register your puppies. If that's the case then make sure you whip up similar contracts for those who buy puppies from you or use the puppy deposits to pay to have the puppies spayed and neutered before you send them to their new homes. Please respect breeding contracts.
If you didn't and your breeder was okay with you having breeding rights then get ahold of them. I'm sure they'd rather answer your questions than have you fumbling around in the dark in unfamiliar territory. If they didn't make you sign a "no breeding" contract when they sold you a high-quality dog then they must have been okay with you breeding. In this case, I highly recommend you contact the breeder and get as much information as you can!