Internet connection to a new house

Hello.
I am Hyun Cho.

I live in Berlin.
I want to build a new house in Schulzendorf Brandenburg this year.
The construction will start next month and will probably be in March next year.
The address is Erlenweg 26, 15732 Schulzendorf.

My current tariff of home DSL is DSL M (max 50Mbps).

But the internet speed at the new address is max 25Mbps.
I want high speed internet access with more than 50Mpbs.

I want to install the media connection for this.
What do I have to do?
Or what can you tell me about this?

Regards,
Hyun

ps. Would you let me know a direct e-mail address to the O2 customer service?