Do not change the layout of the repeater web part (unless it is required).
You need to configure you repeater: specify what data or page type you want to show, where should repeater take this data from, etc. There are different types of repeaters or viewers to show data: repeater with qustom query, bacis repeater, etc. You can either specify what/where to take data from or use datasource for it.
You can find more information about loading data here.
Also you'll need to implement and specify transformation.