These look like they may have clips already on them? Do they? If not, how to do attach them to the exterior of your home?

There's a flimsy piece of plastic that breaks off when trying to clip to anything. You'll need to buy separate clips.

They have a small gutter clip at the base of the LED holder / beneath the reflector cap. These can be used on gutters, or alternatively you can use any generic Christmas light clip accessory found at Lowe's.