Sir,what is going to be the depth of a beam and size of column of span 3.6m for a 2 storey building.slab will be 150mm thick

Hello, 
The beam and column design depend on the type of loading, structure, etc. 

By thumb rule, L/d =10, 
The depth of the beam should be 0.6m and the width minimum of 0.230m. 

The size of the column depends on the number of floors, floor height, long or short columns; without these data, we cannot decide the column size.