shipper must know the necessary paperwork or preferably to have an agent in custom branch in order to do the customs before export properly in suitable trading card which allows to declare the goods which are defined in that trading card chart basically due to each country's custom rules.Also this might help the estimating of the charges of customs before shipping process.
2-Packing:
Depending on the country laws where your shipment is being sent,you will required to packing the cargo in the proper manner.The produsts after packing should be marked precisely .In the cases you are not sure about requirements you can choose a shipping company /career that handles packing also.
3-Insurance of cargo:
The danger of damaging goods is very high especially on international shipments.As this it is more secure to get your shipment insured against harms,particularly if they are highly valuable.If you know the basics and use them in the correct way,international shipping can get generally simpler.

4-To know the shipment of restricted items based on shipping and customs:
You have to check restricted items of both origin and destination countries ,where your shipment must meet the requirements of customs and shipping services which you use ,because if it's not based on rules of country which shipment enters the custom staff will limit your cargo for uncertain period which is not what you want to happen.

5-Modes of transportation:
When you want to export or import goods ,you needs to check your shipping options whether by sea,air or transit services .Additionally shipper must prefer air freight services for fragile or sensitive cargos because in some ocean shipments your cargo can't suffer long trips and Loading or unstuffing process in cross-stuffing.