where did u get your info about male nurses in industrial sites?
with regards to registration to NHA as Nurse, you better go directly to NHA office next to lulu across HMC. They will give u all the required documents including the steps in processing your application.
If you needs pecific requirements;
Educational documents (diploma, OTR & RLE) all aunthenticated.
Nursing license
employment certificate
sponsors letter
police report
medical
these are some...as i've mentioned, you wiull get all those list directly from their office. good luck