You can't mount something that doesn't have a filesystem on it; since blank CDs don't have a filesystem, you can't mount them
Check out the
CD-Writing HOWTO for some suggestions on what software to use. cdrecord is one common command-line program; xcdroast or gnome-toaster are some GUIs that are popular. There also may be some hardware configuration to do, such as loading modules for SCSI emulation; see the HOWTO for details.