Personally I think a cover is essential, if only to protect the kindle. But I like mine because it makes it feel like I'm holding a proper book in my hands. Without it I think it's a bit cold and sterile.
You can store pdfs and other documents on the kindle either by emailing to yourself (there is a cost for this based on file size) or by hooking it up to your computer and just dragging and dropping. I've started putting recipes on it so I can refer to them while cooking.
You can store pdfs and other documents on the kindle either by emailing to yourself (there is a cost for this based on file size) or by hooking it up to your computer and just dragging and dropping. I've started putting recipes on it so I can refer to them while cooking.