how I can apply and get the work permit? pleasd guide me.

Hi Muhammad! To begin with, you should find an employer in Hong Kong. Only after that can you apply for the HK work permit. Prepare the relevant documents and ask your employer to submit the application for you :
1. Application for Entry for Employment as Imported Workers (ID 1001A)
2. Recent photograph (affixed on page 1 of the application form ID 1001A)
3. Photocopy of your passport
4. Photocopy of proof of academic qualifications and relevant working experience
5. Photocopy of proof your medical report

Of course, your boss should submit some documents too, including: application form ID 1001B, four original copies of the standard employment contract (LD 294) signed between the two parties, photocopy of the approval-in-principle letter issued by the Labour Department.