A:Answer The charge plug, ?
You can use a OTF cable and plug in a keyboard or controller. ( none iOS )
You can use a cable to tv to transfer onto a TV (I think) not sure about that one :)
Micro SD card ?
You can use almost every micro SD card in this tablet. I suggest a 'U3'
You Caan transfer apps to the micro SD card thato you download (if the developer supports it)
When Marshmallow comes out, you can use the Microsoft card as storage (part of an extended hard drive, or for removable storage , pictures, files to move to other devices.