The answer to your question is very simple. if you have filled to CIC before getting nomination and get you PER, you have to write to NSNP and declare that you do not wish to stay in their province again.
And if you have gotten nomination first and has not filled any application to CIC, you go ahead and apply to CIC.
And if you have filled to CIC and has not gotten PER probably your nomination comes, you have to wait to see the outcome of the first application made to CIC
NOTE: canadian permanent resident is the same weather from a province or through fsw, therefore, u must not fill two applications to CIC.