If you are not sure what to tell a person, here are a few tips and you can search "Real Estate showing tips" on the web to find many more. (excerpted from here)
1. Less is usually better than more, less pictures, less furniture, less on the walls, less on the counters and less on the floor.
2. Lighter is better than darker. Put bulbs in every fixture, the highest wattage recommended in darker rooms. Turn on all lights and open all curtains.
3. Freshen up paint. Shampoo rugs. Expose hardwood. Wash windows. Make bathroom fixtures and kitchen surfaces shine.
4. Place a few planters with fresh flowers near the entrance, mow the lawn, trim the edges, and in winter (in the north) keep it shoveled, salted, and/or sanded.
5. On the outside paint the most street visible areas. Stand in the street and look at the paint or siding, shudders, curtains, plants, grass, drive way, roof, chimney, etc.
6. Trust your instincts: If you think something should be done, generally you're right, do it!
