Advice about distributorship?

I have a small (UK-based) company offering a service. I am quite well established: Ltd co...VAT registered...rent a small unit/studio.....have some storage space...advertise on web and have SEO in place....and so on...I now want to start selling selected products that are relevant to my business. So I am trying to get the UK distributorship for a company based in Hong long so that I can sell their products here. Can you offer tips and advice? I would especially welcome recommendations about contractual issues and reasonable mark-ups. Ta. (This HK don't seem to have any other distributors or 'franchise' options ready-set up).