You will first need to assess the amount of damage. Once you walk in, normally your nose will detect the degree of smoke abatement that is required. If it is heavy, you will need to:
a) Wash and paint all the walls and ceilings.
b) Wash all the windows, ceiling fans, cabinets, doors, trim, clean the drapes and Venetian blinds.
c) Clean the carpet with hot water extraction and a commercial deodorizer.
d) Replace the furnace filter.
e) Set an ozone machine at the furnace cold air intake register and run it for about two days...