I posting in English because this might be useful also for other users otherwise I would have posted in German

So, long story short I'm moving to Germany/München starting next week. I need some info regarding on how the Deutsche Post works. I mean how do you get international packages for example can you give your work address or home address (the place you have rented)? For international packages you get a notice and you go to the Post Office or these get delivered to you ? Do you need the payment proof for the Customs Office ?
The same goes also for EU/German packages bar the Customs part

Also if you want to send stuff some tips would be good

I'm an expert in Romanian Post stuff, know all the tricks so I feel naked in Germany from this point of view. At least I don't have to worry about the language barrier

Thanks!