Opps ya might have to restart....
I never go back to nurbs once i convert to polys=).... you would need a really clean mesh with no wrinkels to get a nice nurbs surface again.. Once you convert to Poly use spliy polygon tool to start adding edges.
I am enough of an artist to draw freely upon my imagination, knowledge is limited, imagination encircles the world. (Albert Einstein)
https://www.artstation.com/kurtb