One mistake most business owners make is that they tend to startup their business, then after that they start trying to build their customer base. This can have a negative effect, especially in a situation where you have to pay rent for your business. It would be much better to first build your customer base before startup. Before your startup, you can start creating awareness amongst friends and families, letting them know what you would be selling, with this you will also find out does who might be potential customers. So once your business kicks off, you already have a customer base.