Replying to [Pippo]:
ISO certificates are not compulsory, but they will help you to show your abilities to clients to meet business requirements. For trading company, ISO 9001 is enough, could be latter, no need at the start up. But for manufacturers, home decor items for example, it is better for them to show their production in conformity with requirements of some standards as ISO 9001, SA 8000 or the materials are tested free of some specific chemicals...
If you need support and more information from Vietnam, I am very pleased to exchange with you.