Now that you have ALL of your proper registrations and identifying numbers, you are able to fully complete your title info on the MyIdentifiers page and then generate a barcode.
What you will need:
d) Book Dimensions & Weight
e) Bibliographic Data
f) Retail Price
Updating Title Info
This is key because Bowker will include this information in the Books-In-Print database, which is used by many retailers and librarians to identify or find available titles. Additionally, you cannot create a barcode without the information detailed above.
Creating a Barcode
This is important and fun and completely anti-climactic. Creating a barcode is a piece of cake once you've followed all the previous steps in the process. On your MyIdentifiers account page, you simply click to create a barcode for your title.
Almost instantly, a jpeg of your barcode will be generated. Save it to your computer. Additionally, the files will be emailed to you in jpeg and eps formats. Eps is vector-based and can be cleanly enlarged to any size. But now that you have the barcode, you can complete your cover art and submit your title for production.
Note: if the price changes for your title, or you create a new edition and thus a new ISBN, you will need to replace the barcode with a new one. Right now, it costs about $25.