Hello,
I think I understand the questions but if you need more clarification, please let me know.
1. In Display Settings, you should be able to enter Search Instructions. This text uses the styles for h1. You can style your Heading 1 or style the class "locatorHeader"
2. You can search by zip and/or city, state, but business is not a field available for users to search
3. The locations details field is rich text and will allow you to attach a document to your locations to be viewed in the locations detail screen.
I hope this helps.