buy Vitamin Packaging

We are in the process of starting a new business where we are bulk buying minerals and vitamins and packing into 1kg bags although this business is small to start we are confidant it will be fast growing. What we need is someone in China to take care of receiving the drums of vitamins putting them into 1kg resealable bags and then vacume bags then forwaring on to us in the UK to start with but possible worldwide. Also we would like to know if you can mix vitamins together for us if required.