There are many factors to determine how much you may qualify for. This would be an excellent time for you to elist the help of your lender. Find a loan officer that you are comfortable with, they will walk you through the process.
Unfortunatly there is no way to speed up the process. The bank may request more information and you should see that it is submitted as soon as possible. Depending how many loans were on the property, you may be dealing with multiple lenders.