By default, the unit should have a DHCP server configuration.
Do you get an IP address when connecting to it?
Can you ping the ASA?
The error you are getting is making reference to a mismatch on the encryption methods, looks like the ASA doesn't have the 3DES/AES license installed or is just missing the ssl configuration.
This can only be fixed by accessing the console of the ASA, since none of your computers have a serial port, an USB to serial seems like your only option.
