Regarding certificates

HI , I am using Freeradius 1.1.6 version on Fedora. When I checked the /etc/raddb/certs directory, the certificates for testing EAP-TLS method are expired. So I am trying to create my own certificates using Openssl for EAP-TLS. My question is , Do we need to give separate commands for creating client and server certificates OR we can follow the same method for creating both ? I googled the query regarding certificates but I did not find any good site for creating client and server certificates Can anybody suggest some links for this?? -- Regards Pallavi