How to generate and sign SSL keys to use FTPS

[dictum9]

HP-UX 11.31

OpenSSL 0.9.8

openssl req -new -x509 -keyout /opt/openssl/0.9.8/misc/demoCA/private/cakey.pem -out cacert_110116.pem
-days 3650 -config /opt/openssl/0.9.8/openssl.cnf

I need to use the FTP program with the -z option pointing to the cert file, what is the exact syntax? Does the FTPS server need to sign the certificate I just generated or do they provide me with a certificate they generate?