Make sure you have: Created a Country, City, Property, Unit Type, and a Unit. If no units have been added, nothing will show in search results. You have rates showing in Rates & Availability Calendar under Calendar
The photos that are displayed on the Booking Engine are the combination of all the images set in two sections: Property and Unit. If you would like to change the images or their order you can go to Listings/ Properties/ Property/Images tab and/or Listings/ Units/ Images tab.