A:AnswerYes if you want to use a Bluetooth mouse such as the Magic Mouse from Apple. If however your wireless mouse requires a usb dongle to communicate you will require a usb type c to USB adapter.
A:AnswerYes you do, Not much in life is free and if Apple includes a trial with your purchase, its a trial youll pay eventually... much like the annual life insurance give "FREE" by banks.
A:AnswerOpen box means somebody bought the product, decided they didn’t want it and returned it. It is supposed to be inspected and made sure that it is in proper working order, and some of them will still have a warrantee behind it others well you have to read the fine print. Sometimes you can get great deals with an open box especially if they will back up the product for any problems you may encounter.
A:AnswerMac OS is really easy to navigate for beginners and it should take a few hours to get the hang of it. And the office suite is all compatible with macOS. You can also use bootcamp to run windows if you don't like macOS