USB C > USB A is a must for any 1st time Macbook owner. Other than that, nothing much else, all depends on your needs. Since I miss MagSafe so much, I decided to buy a 3rd party MagSafe cable as well.
I ordered a usb adapter with the MacBook. Which magsafe cable do you have? I've been looking at a few of them, but can't decide which one to go with.