Good. But that's also mandatory.
Not necessarily. I generally advise people never, ever use the LOAD terminals except when they actually intend to provide GFCI protection to the downline. Too many people use LOAD "because they don't know where else to put the 2 extra wires" and have no idea what they did or the consequences.
Well right off the bat, you may not have a choice. If the tapped outlet is in a space that requires GFCI protection, you need to fit it there.
Darn right! GFCIs have a spectacular failure rate when "left outdoors".
Remember you must use outdoor cable outdoors (UF-B) and you must have a junction box, and an outdoor "weatherproof, in-use" cover that provides for cords leaving while it is still hooked up.