Looking to buy Aluminium extrusion

We have a buyer of Aluminium extrusion 6063, 10k MT per month for 1yr. The destination will likely be China.
Please infrom us on the following in your offer:

• Where would the product be sitting and depart from
• What is the max qty avail now
• What is the max qty avail per month
• What is the CIF price China
• How is the product packaged
• Are there any commissions included in your price
• What proof of past transactions does your group have
• What is the seller's SOP
• What is the seller's payment terms .