Enter title of the listing and description. Then go to the bottom and check Basic info, Media and Address tabs:
Address tab will show the listing location in the frontend.
To upload images, first upload it to Media > Library and select them. Also, you can drag and drop images to change their order in frontend. The first image will be used as a listing box image.
To add video, please enter the code like displayed on screenshot. Video will be shown in Video tab.