I don't know if Edges have a "return to start" feature or not? My watch has two versions of that (back the way we came, or take the shortest line) but I've never looked for it on the Edge. I've just used the map - you touch a place and a "go" button appears.

You can turn any kind of notification on or off, so yes text no email yes call. You can allow (or block) notifications from any app you have on your phone.

I'm not finding any screenshots of notifications on an 820 but this turned up: