We installed episerver forms through the nuget package, but when we create the forms there is no preview or on page editing. All we see is the all propeties view.
Was this installed on a blank site or on an Alloy site?
By default an empty Episerver site does not have a preview controller. You will need some templates in order to preview the rendering of the form.
I suggest taking a looking the PreviewController.cs in an Alloy site to see how this can be achieved.