i uploaded photos edited and by mistake created a collection but only one. Now i am unable to find all the images downloaded. How do I find those originals and the edited one
In Library module, look under Folders panel which would list the folders that you have imported.
Or, under the Catalog panel > all Photographs.
Lightroom would show a badge of + and - on the thumbnails indicating that those images with this badge have been edited.
You can right click/command click on any image and choose Show in Explorer/File Explorer and that will take you to the actual location of the image and will show unedited version as Lightroom references to the original location of the images and does non-destructive editing.