You will need to make some modifications to some of the files
1. bitcoin-fullnode/electrumx_server.service - Update both the <user> and <password> tags which are used by DAEMON_URL
2. bitcoin/bitcoin.conf - update externalip, and set rpcauth (use the provided script to get salt and hash), use the same password used in the electrumx_server.service file
Then get the services installed and start them up and monitor them for a bit.