Hello !!! I am new in this flex tech

I have made a project in AS2 with Flash. and communicating with the data through XMLs

here is that link http://sanjoghelpline.in/Application_RWSS/default.asp

Now I have to play with large set of data with graphs, grids, different options etc on this maps. I think Flex will be best for it. it will directly connect to the database to fetch datas. I am planning to use webservice.

So I need your suggestion and tips for this. And what serverside language I should choose.