How to get the Permission for Building construction?

I am from Khammam. We would like to build a commercial complex in khammam town. But some body told me we need to get a planning permission from Warangal (RJD office – regional joint director office) if we need to go for certain floors on the building. Can anybody have any ideas please?, how to proceed for this to get permission. Any sort of ideas, advice are welcome and much appreciated !!

many thanks