IPad 4 question about ppt and word

I have a Iphone and like it very well. I like the lay out of the IPad 4. I am not a tablet expert and need help in a decesion pertaining to IPad and what I would use one for. I would like to be able to easily store ppt and word to review before I teach classes. I also do facebook, email, music, ect. Netflix I would like to have a tablet that would do this without alot of complication especially when it comes to the ppt and word. Is there a way to hook a USB adaptor. I have researched and there is conflicting options. If some of you would be kind and reccomend what I need for what I do. I like the IPad, but would it be more practial for me to consider the andoid type. Appreciate any help in advance. Thanks