I got my NAS up and running.
To use the files remote (via internet) as if they were on my computer, i discovered a nice tool for mounting the filesystem via terminal and ssh, so no extra configuration is needed.
Here is the link to a wiki-page:
And here is my line:
sshfs -o reconnect -o sshfs_sync $myserver:/path/to/mount /local/mountpoint
The reconnect option is useful if the internet isnt THAT stable ( or youre changing locations, for example when using a notebook) and sshfs_sync enables write-sync, so that the progressbar while copying is showing whats really already written, and its not put into some buffer or something and synced in the background. For using it over the internet with my notebook its useful, because you can tell if its already done, and know whats left to copy.
So… Nice tool!