I want to be a truck driver there (Germany)

1. To become a truck driver in Germany, you need to be offered a job as such. Thus you should apply at applicable companies, e.g. logistics companies or freight forwarders.
2. Language skills are important, but English is uncommon among truck drivers. So you might want to learn German first to maximize your chances.
3. If you are not EU citizen, any employer would need to prove that they cannot find suitably skilled applicants who are citizen, before they could hire you. This will be your biggest hurdle, given the high unemployment rate among lower skilled professions. Focus on your niche skills that are rare and in demand in Europe. (For a truck driver, I have no idea what that might be.)
4. Lastly, you need to convert your driving license to a German one. If it is not or not fully convertible, you may need to take lessons and pass driving tests again.

i am Pakistani i am working as Dispatch Rider Govt Department.i want come to German. My Qualification Matric Science with Light Transport Vehicle Licence Holder.any help me

You should also follow my advice above!