Wimax Coverage

I intend to provide internet and Voip over Wimax , the expected area to be covered is about 5 km radius with high building density, the expected users will be about 30,000 user with 1000 concurrent connection. We intend to use 802.16d  fixed wimax   .
What is the number of base stations?  
what is the actual coverage of fixed wimax base station in high buildings density?
how to connect base stations with each others?
What is the actual bandwidth that i can count on ?