Steps in acquiring Comodo Code Sign Cert:
1. Find reseller (gogetssl.com or some one else) and place your order
2. Login to gogetssl.com and use "invite link" to fill up the details of the company and submit. Here, ensure that you use the same computer that you will be collecting the certificate. It is to use the same computer for the certificate request and certificate collection as the private key is stored in "that" computer.
3. Register with Comodo Support site
4. Upload necessary documents
a. Individual - your identify proof, and address proof
b. Corporation - Certificate of Incorporation, and Certificate of Commencement of Business
5. Wait for the certificate to arrive.
6. Take a backup of your private key and the certificate
For specific documents required for verification, check out this link:
https://www.instantssl.com/ssl-certificate-support/validation_guidelines_table.html
Comodo support website link:
https://support.comodo.com
Comodo forum link:
https://forums.comodo.com/
Gogetssl link (Cheapest available, after tucows):
http://www.gogetssl.com
Finally, you need to export the private key certificate. Use the procedure below to go ahead with it:
https://www.thesslstore.com/knowledgebase/code-signing-collecting-export/download-export-internet-explorer/