Hi,
Like GigiDG said finding a doctor that knows more about PCOS is the ideal solution. If you are like me and not prepared to wait about a year for an appt to come, you can also do your homework and bring your doctor some good reference like articles from MedPubs.
For your questions, I'm not a doctor just a patient like most of us here, but here is what I learned with reading about everything on the subject.
1- Yes at first met will make you loss a few pounds.... probably because of the side effects. You have to remember its not a miracle pill, it just put you in a fair game... so when you eat well and exercise... you'll see some results
2- Some girls could correct me on that one.... but my understanding is that Glucophage is a brand of metformin
3- As for your period... they should come back with met. But for me, at about 200llbs, it took a few months and about 1750mg to have an ovulation... and I got pregnant on the first cycle at 2000mg. So depending of your weight that might change when you start ovulating again. As for the question of period without ovulation, I read that yes it is possible. It like your system need to empty/clean itself after a while... I can't remember were I read that but I did confirmed with my doctor.
good luck and be patient... and its never too early to ask for a referal to a fertiliy specialist...