Hi SLady glad you found us! Sorry I haven't replied sooner been mad with work-have just caught up and can see you're already well on the way to getting familiar with everyone. This really is a lovely bunch 
Like boggle said, do go back and read the previous threads that what I did when I started out.
I had similar start to you-all very new and not sure what came first! I had no periods at all so had the main. Looks done there and then as don't need to be on a particular day. The FSH and LH need to be during a bleed so you may get a short course of progesterone to bring that on. It's fine and from then they may ask for a day 21 As well, although with the long cycles day 21 usually doesn't show anything.
Everyone is different, and I personally decided to go private and pay for the further tests to have my answers there and then. It has helped me because I am a control freak and need answers! I am now waiting on NHS referral to be given clomid - not sure if anyone has mentioned already but your GP cannot give you clomid it has to come after referral to specialist. They can give you metformin though which is why that comes first.
I'm on metformin but have never actually been told I have IR. I'm not sure you ever do need such a test you just give it a try and if it works great. It is making me lose a bit of weight but no signs of AF sadly so i am about to embark on the next step.
Emotionally I am flicking from positive to helpless. It's very hit and miss at the mo, but it's nice to have this thread to share things with.
Hope this helps you xx