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If you are in Pakistan then i would be tempted to use "Precast Concrete Columns" rather than Steel Columns due to limited availability of heavy sections; Steel Sections are used for speed on construction. Nevertheless: I have designed a steel column / concrete flat slab (plate) configuration previously. This is your best course of action: 1. Decide which "design code" you will use for the design, and follow its procedure for slab shear check; This is key; 2. The steel columns will require short cantilever sections coming out into slab; 3. Make sure you can feed reinforcement through the steel section or above and below it and get adequate concrete cover; 4. Check slab shear - you will require lines of shear (vertical) reinforcement within slab, successive perimeters, around the column; Slab shear check around column is key!