Where can i get work permit ?

Dear Mohammad Naveed Hashmi , thank you for getting in touch.  If you want to get a work permit in Germany, in general, you must be considered a skilled worker: https://handbookgermany.de/en/recognition If your degree/qualification is already recognized you will need to apply for jobs: https://handbookgermany.de/en/jobsearch-and-application#faq_108 
As soon as you receive a work contract/job offer, you are able to apply for a job visa at your local German embassy. Lastly, I would like to share ALL DIFFERENT TYPES OF VISA and their requirements: https://handbookgermany.de/en/immigration This is a quick way to review your options: https://www.make-it-in-germany.com/en/ If you have any further questions, please let us know. You can also ask for advice in the forum, e.g. see if others have had similar questions or topics and write your questions below + tag the person (with @). Best Barbara