1. Are you manufacturer or trading company? We are trading company. 2. What shall we do if don't know how to operate your machine after bought from you? We have detailed installation and operating instructions attached,it is very simple. We have telephone and email support at 24 hours a day. 3. What are your payment terms? We support T/T, L/C, Western Union and so on. Other ways can also be received after we both sides discussion and agreement.