Thank you for that advice

I opened the debug console, found the (i think) relevant command "aliasnew", but there is a list of parameters of which i'm not certain which values to use. Could you help me with that, please?

aliasnew [aliasname] [public value] [accept_transfers_flags=3] [expire_timestamp] [address] [encryption_privatekey] [encryption_publickey] [witness]
alias name. speaks for itself
alias public profile data, 256 characters max. can i leave this empty by just typing a blank space?
0 for none, 1 for accepting certificate transfers, 2 for accepting asset transfers and 3 for all. Default is 3. i guess the default 3 is fine
Epoch time when to expire alias. It is exponentially more expensive per year, calculation is FEERATE*(2.88^years). FEERATE is the dynamic satoshi per byte fee set in the rate peg alias used for this alias. Defaults to 1 hour. i assume here i have to use epochconverter.com to calculate the timestamp (in seconds?) of around 1559253600 for today in 1 year from now?

Address for this alias. the receive address in the wallet from which the alias payment is made i assume?
Encrypted private key used for encryption/decryption of private data related to this alias. Should be encrypted to publickey. i used dumpprivkey command on the respective receive address that holds the funds
Public key used for encryption/decryption of private data related to this alias. i used validateaddress command on the respective receive address that holds the funds and looked up the pubkey in that list
Witness alias name that will sign for web-of-trust notarization of this transaction. what to set here? can i leave it empty?

Thanks in advance!