What are the requisitions for opening a office for trading purpose

Hello Mate

                  I am a trader in India and want to establish a office/shop in Colombo for industrial products like ball bearings, personnel safety etc. I need to know about the local formalities for a non-citizen to open a shop (where products will be procured from india), what are the legal requirements and other related information

                  May I also know what is the approximate cost involved in setting up the shop/office, salesman remuneration and other recurring expenses.