What are the other requirements in hongkong authorities needed for me to go to dubai., except for my passport and e-visa..

visa issuance from dubai, departure in hongkong,

I am planning to have a 3 day vacation at hongkong next week, then from hongkong i will go to dubai to visit my friends with my visit visa copy (not the original copy its called e-visa).
What are the other requirements in hongkong authorities needed for me to go to dubai., except for my passport and e-visa.. thanks