A:AnswerYes. Some streaming services may restrict screen size but unless the content provider places those limitations this will allow full screen presentation from iPad to television.
A:AnswerNo this is a USB C adapter so it plugs into a MacBook not into an iPhone.
You may want to go to a store with your phone, explain your need and get a recommendation on the best adapter for you.
A:AnswerIf you have a iPad w/ a USB-C port I’m sure there are SD to USB-C, otherwise I’d upload to the cloud and you should be able to access photos that way through your iPad w/out having to buy anything.