See if these help you out Candy.
You would need to put it on the eave of the house over your door or a porch cover if not the eave and they come with the parts to attach them. Also I would advise running it along the house with a drain spout at a corner. We catch all of ours to water our fruit trees in hot summer.
Home Depot sells straps to hold it to the roof
Hope this helps https://www.familyhandyman.com/roof/gutter-repair/how-to-install-gutters/