“So if i am correct it tells me that the signature is correct but also
the key has no trustworthy signature. Is this because i don’t have a
masterkey in the keyring as of yet?”
No, it’s because you have not yet set a trust level for whatever key(s)
you have imported.
The suggestion in the instructions is that you import the Master key and
set that to a high trust level - this will cascade trust down to other
keys signed with the Master Key.
You should find that the instructions for gpg in linux carry over exactly
to pgp4win at the command line.
Import the Master key - gpg --import
Set it’s trust level