Welcome to FT and the EK forum. Most of the information you need can be found on the EK website, but here's my thoughts anyway.
Transportation will be provided to/from your hotel for the long stopover on the way out. I'm not sure what hotel they use but I'm sure someone will be along soon who does.
There is no chauffeur service in ADD according to the list here:
http://www.emirates.com/us/english/p...available.aspx
You will be entitled to use the T3 Business Lounge while waiting to depart for ADD but unfortunately no lounge in ADD or DXB for the return:
http://www.emirates.com/us/english/f...e_lounges.aspx
There is a baggage calculator here:
http://www.emirates.com/us/english/p...alculator.aspx
Remember, you will only be entitled to the economy allowance.