Document Editing iPad and Bluetooth Adapter

So I am about to receive my iPad mini tomorrow, super excited :D, and I had a question about editing documents on it. Currently I have all of my word documents from school on dropbox, and I was wondering if there was a way to work on these files while keeping them synced in dropbox?

Also, I want to make my speakers Bluetooth compatible with an adapter, and I was wondering what I could use. I have tried to search this, but got nothing useful and I thought you might be able to help. Basically I just need an adapter that plugs into a 3.5mm headphone jack (so it would be a male adapter), which could receive Bluetooth. Any other recommendations on how to use this are welcome, I want to be able to stream from my iPhone and iPad.