Firstly, in order to use certificate, issuing the CA's certificate is needed signing by itself. This certificate is used to issue 'normal' certificates, so the other module's features would not be available until it exists.
To achieve so, we enter in the module's page and we find a form to create the CA's certificate. The form requires the organization's name and the number of days till the certificate expires.
Establishing certificate's life, we have to keep in mind that its expiration will also expire any certificate issued with it. This would stop any service which depends on the revoked certificates.