Your graphic design should be ready to go by this time, either film or files. For short runs you can use your inkjet printer. For certain medium size runs, you can use color or black and white copiers. For longer runs, where you don't want to burn out your printer at home, or don't want to cut out a thousand tray cards with a razor blade, you'll take your film or preflighted files to a printer. Duplication and Replication are different processes and which one you use will depend on how many copies you need.
Replication is the process of making CD-Rs.
If you want to burn ten at a time at home as you need them, this is the way to go. Duplicate when you are going to need 300 or more copies, because of pricing.