According to Vastu Shashtra your shop is on basement and it is North facing is suitable. If it is as following map than it is the best
In the shop cash counter should be at South West corner . The shop owner is face towards East or North direction . The cash counter should exact in front of owner his right side . In the shop the best place of heavy item is at North West corner . It is also called vayavy kone . If it is not possible than second option is South West corner and West direction.