Hi Dillon,
If you have a page where you can edit object properties, you need to pass an object to that page. In order to do so, you can have the open page action in a datagrid toolbar, for instance. Or contained within a listview that lists object of the desired type. If you want to create a new object, you can select ‘Create Object’ action for the button instead of the ‘Open page’ action. Mendix then automatically creates an object of that entity and passes it to the configured page.
Hope that helps.