[matco11]

Your question does not provide much detail to go by... but three important, general principles to go by are:

1) make sure the manufacturer you are talking to is already manufacturing comparable products - efforts to make them manufacture a type of product they are not already familiar with are likely to fail;

2) make sure the manufacturer you are talking to is already manufacturing at a level of quality that is in line with the quality you want - efforts to make them manufacture at a higher level of quality than the manufacturer is accustomed to are likely to fail;

3) familiarize yourself with regulations for the manufacturing, import/export, and sale of the product you want to develop before you talk to the manufacturer - regulations will always eventually catch-up with you and you risk wasting effort, money and time not covering them in advance.