Shipping packages is lots of fun but it brings it's own set of challenges. Sometimes things can go very wrong if not handled properly.
Section 321 was put in place to make it easier for US shoppers to purchase items overseas. Since then, businesses have found ways to take advantage of this.
Finding warehouse space for yourself can be difficult. It can also be really fun. Either way, it's a big commitment so make sure you know what you're signing up for.