Please, make yourself familiar with basic knowledge about IP networking. And I mean really just the very basic knowledge.
How will you manage your server when it comes to Firewall and security settings? Be aware that your server is attacked once per second as soon as it has a public IP address. And there is no system firewall at Netcup, like other hosters do it. You have to configure everything on your own. Are you sure, you are able doing this?