Not 100% sure all these fullframe recommendations are helpful for someone purchasing a 80d. I'm sure budget has been considered.
To OP, I'd get the 18-135 with the camera as likely you'll get it cheap and it will be a lot more useful than the 18-55mm, I am sure quality will be similar, that is likely a very good lens in good light, not so much in lower light.
A 50mm lens is generally considered a nice focal length (on a crop camera)for portraits, combined with a fast aperture. There are various 50mm lenses from canon and canon fit from sigma that are f1.8 or f1.4. One of these should be nice, as are the 85mm mentioned earlier but you'll need distance to fit people in at that focal length.
Weddings- are you a guest taking the odd shot, or intend on shooting the wedding, because without being a smart ass, if you need to ask what lens for wedding you probably are not experienced enough to shoot one just yet