A:AnswerApple Pages is included right out of the box. It really should work for basic use. I added MS Office just because that is the Software I have used for many years
A:AnswerThat entirely depends on what you're looking to do. It comes with the basic Apple branded office applications but I'd recommend the Microsoft Office 365 suite at a minimum.
A:AnswerSure. Just get a USB adaptor plug as most mice, keyboards, etc. plug into standard USB ports, but newer Mac Book Air models feature the smaller USB ports.