PCI DSS v2.0 Document: https://www.pcisecuritystandards.org/documents/pci_dss_v2.pdf. This is a good starting point. It has everything one needs to know about PCI Requirements and Security Assessment Procedures.
Next you can look into Self Assessment Questionnaires (SAQ) Instructions and Guidelines: https://www.pcisecuritystandards.org/documents/pci_dss_saq_instr_guide_v2.0.pdf. See which category you fall in and then download the appropriate SAQ from this link: https://www.pcisecuritystandards.org/security_standards/documents.php?category=saqs.
Some Additional Links:
All PCI Standard Documents download link: https://www.pcisecuritystandards.org/security_standards/documents.php?agreements=pcidss&assocation=PCI%20DSS.
List of Qualified Security Assessor (QSA) Companies: https://www.pcisecuritystandards.org/approved_companies_providers/qsa_companies.php
PCI FAQ: http://selfservice.talisma.com/display/2n/index.aspx?c=58&cpc=MSdA03B2IfY15uvLEKtr40R5a5pV2lnCUb4i1Qj2q2g&cid=81&cat=&catURL=&r=0.837099552154541
Hope this helps.
Mo
Just to add to my previous list you should also look into the following documents. These are primarily for your Tess Support people. This is to make sure that your business application that processes and stores credit card information, Tessitura in this case, is PA-DSS (Payment Application-Data Security Standard) compliant:
Tessitura PA-DSS Implementation Guide: http://www.tessituranetwork.com/network/Learning/Documentation/Security/Tessitura%20PA-DSS%20Implementation%20Guide.aspx PCI Compliance Trace: http://www.tessituranetwork.com/network/Learning/Documentation/System%20Administration/PCI%20Compliance%20Trace.aspx
Tessitura PA-DSS Implementation Guide: http://www.tessituranetwork.com/network/Learning/Documentation/Security/Tessitura%20PA-DSS%20Implementation%20Guide.aspx
PCI Compliance Trace: http://www.tessituranetwork.com/network/Learning/Documentation/System%20Administration/PCI%20Compliance%20Trace.aspx
This is the ebook I mentioned during the breakfast PCI discussion: PCI for Dummies.
You'll get spammed by Qualys but I think it's worth it for the information (and they're a totally legit vendor as well if you need scanning, etc... done).