Experience, training or licensing may be needed
If you don’t already have work experience with importing and/or exporting, you will have a longer learning curve. You can start by learning the basics and hosting educational sessions to teach others what they need to know to get started in import/export. That alone would probably gain you your first couple of clients. If you keep going with educational seminars and expand your reach to outside your immediate region, you could probably develop a sufficient and ongoing customer base very quickly, but be careful not to outpace your learning curve!