Depending on your answers, you may or may not be eligible for the Federal Tax Credit and or the California Tax Credit.
Ask a local, experienced full-time Realtor for help.
If your time line is within the above dates, your rebate would be $8,000 providing you do not owe anything on your tax return. If your tax liability is $1,000, then you would receive $7,000 and so on.
Hope that helps.