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I've been in that situation plenty of times. The sandwich definitely won't taste as good on that next day, but it will be edible. You can eat it yourself if you want, but you might not want to share it with a friend.
Sure, but to avoid the browning of the avocado, I only add avocado just before eating. You can save the other half of the avocado with plastic wrap over it.
I would scrap it off before storing it in the refrigerator. From my experience the bread gets very soggy and the avocado doesn't taste so great the next day. I'd add new spread or fresh avocado right before eating the sandwich.