You'll need to automate your customs declaration forms. It helps a great deal if you can include any customs duties in the prices you charge. For example Cana

You'll need to automate your customs declaration forms. It helps a great deal if you can include any customs duties in the prices you charge. For example Canada has a %15 tax. If you sell a book to a Canadian, you can save everyone a lot of hassle if you can just include that duty in the original purchase, then make arrangements with Canada Revenue Agency to pay it directly to them.