If I have full name about someone in Germany can I find phone number o email about him? How can I start looking?

If you know only the name, it will be hard but not imposible...
But if you have the name, you also have other information related to the person...
with more info linked to that person you can find out more...even number and other information...
Start from what you know....and dig...
Good Luck
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you can start here https://www.dasoertliche.de/ but as said before, you need to start digging by yourself