PCI SAQ Security Links
It seems there are a couple Google searchs that can be done to help find the forms you need to fill out the SAQ as a Self Reporting Web Hosting Company of links out there. But it took me a little bit to put them all together.
I am not a PCI Security Consultant so dont take this as any kind of gospel, but here are the forms I found that I needed.
To fill out the Attestation of Compliance SAQ D 3.0 for Service Providers, get the form here:
If you are not a service provider, perhaps you need a different form
For a quick reference, see their file here
The PCI DSS Glossary has details of many of the items mentioned in the form