Yes
Yes you can join online. Also you can use Google Express to shop there and deliver to your home.
Better to do it in person
Yes, but you will bring your email from Costco with member number and ID to pick up cards instore.
I believe so.
Yes. As the previous poster said, you'll need a physical membership card. It has to be shown when entering.
Yes, but you will need to visit the membership counter should you want to shop at a location to get a card. It takes 5 min.
Thanks! Your answer is awaiting moderation.