Where can I find and view the NFZ before I arrive at the site for flying the drone?

http://www.dji.com/flysafe/no-fly

you should also check the local laws. the dji nfz are not accurate.

Here's the website for your reference: http://www.dji.com/flysafe/no-fly
Any map provided by DJI is for advisory purposes only. It is always the user’s responsibility to determine what laws or regulations apply to any operation, and to obtain any required government authorizations.