Ha ha...darling nomination is miles always...I have noi only and with that I m eagerly waiting for oinp to open....and I l just bang on with my noi
For OINP you don't need PCC and Medical details..
You would need that when you are submitting your PR application.. like OINP, you submit/upload documents..sameways you have to submit these while filing your PR application without which you can't proceed to payment and submission..
For Medical
So if you are awaiting/hv received nomination.. i would suggest don't wait.. get medical done at CIC recognized medical center http://www.cic.gc.ca/pp-md/pp-list.aspx in your/nearby city..
For PCC
If you have stayed in any country for more than 6 months cumulative (i.e. in 2013 - 4 months & in 2016 - 2months) you would need pcc from that country..
Make sure you arrange PCC for your home country as well.. and if you are Indian.. get your PCC from PSK only..