If I want to go to German what should I need to do...

If your inquiry is about residence in Germany for work and residence , find the following information:
Andorra does not have an organized program for welcoming immigrants for the purpose of work, and according to that, you will have to obtain an employment contract from a company in Germany, so that you can obtain residence there for the purpose of work.
Therefore, we recommend obtaining a tourist visa and then searching for work while you are there and your visa is still valid, provided that you leave and return to your country, and then the employer sends you the work contract to your place to enter Germany again under the work visa.
Moreover, the employer is the one who takes all the procedures related to getting the work contract and work permit.
Documents that should be submitted are:
Proof of no criminal record
Certificates of work experience
Certificate of proficiency in a foreign language
Passport.
A copy of your academic certificates.