Sun spots/halos in my photos....

Did you use a hood?

It goes on the end of your lens and keeps out extra glare, especially from the sun. But it will work with any excess light and sometimes help if you are shooting into the sun, like in this photo.  Ideally you want the sun at your back.  If you can't do that (like shooting the canyon), try to put the sun at an angle or have someone shade the camera sensors.

Lens Hood

Looks like you need to clean your lens too. That doesn't look like lens flare, that looks like an artifact that lit up when the light hits it. Clean both the glass on the outside and inside.