How do I calculate the requirements of a product in a country or region? -

I am writing a business plan to supply my products in the Middle east region and need some help. I am trying to find figures to support the market need for a home appliance.How do I get the rate of increase of house numbers in a country?How do I get the rate of increase of coffee shops in a country?How do I link the GDP with the number of units required?So many hows but perhaps this will be a good start for me filter down and get the figures i need.thanks.

Some wild ideas :1.Call the stores in Middle East and talk to their purchase dept. Ask them if you offer this product for the best price how large an order would they place. 2.Check how much coffee is imported into the country. Call up a coffee shop in middle east and ask them how much coffee they would buy if you provided it at better than best price in the market.Let me know if you figure out the answers. I would be interested in how you got the info.