Data collection

We are an Australian company who would llike to gather some information for a marketing mail-out campaign. We would like to target business owners / managers in a specific geographic area of Brisbane / Queensland and we require assistance to gather data such as business name, postal address, email address and contact person for each business. We will be able to give you some starting points on where to look for this information. We would like the data delivered in Excel formatted so that we are able to do a mail merge in Word ie each data lable in a separate column in Excel. Could you please give me an idea of costs and estimated time to complete this job. Thank you.