This is a very important and broad question.
There are many different aspects which need to be considered - some countries have more regulations for shipping chemicals. I would highly recommend that you contact a person who is professionally trained in transporting the products and registering the appropriate documents in the countries that you wish to ship. These regulations change from time-to-time, so you need to keep up-to-date with all the recent changes - otherwise you can encounter legal problems.
A starting place would be to understand QHSE (Quality, Health, Safety, and Environment) regulations, transportation (TDG, or DOT in North America) WHMIS (workplace hazardous material information system) to start with.
I hope this helps you with your question,