Now you need to work out what kind of shopping fittings you will need to properly display all of your products. What you need depends entirely on what types of products you are selling. For example, if you are starting a clothes store, then you will needs rails, shelves, and fitting rooms for customers to try the clothes on. You can get some inspiration on the types of fittings you will need by visiting stores that already sell what you are planning on selling.
Putting large sized mirrors that span from the floor to the ceiling are very trendy. You can place them in your windowless hallways, landing and bathrooms so as to reflect the light and make them look bright.