Working in Shenzhen, want to apply Hong Kong Visa

Hi,
I am from Pakistan and working in Shenzhen since 10 November 2015, I want to go to HK for multiple times for shopping during my stay in Shenzhen.
I have some questions:
1. Should I apply for Visit Entry Permit?
2. Which type will allow me for multiple entry?
3. How much for HK entry permit?

Please guide me
Thanks and best Regards,
Tanzeem Bhatti