The following is a Business Requirements Document - Document Template for you to use. It is a "blank" document which can be filled in to complete your business requirements:

Business Requirements Document - Document Template (MS Word Format)

If you don't have Microsoft Word, here is the same document, in PDF format:

Business Requirements Document - Document Template (PDF Format)

Below is an Excel version of the Business Requirements document. Some people like to store their requirements in a spreadsheet. This spreadsheet also has has a sample Vendor Matrix which can be used to evaluate different software vendor's products:

Business Requirements Document - Document Template (Excel Format)