Building database of suppliers and manuafactorers

I am looking for building a database of possible clients that does produce biodiesel, this leads has to be categorized by mail adresses, country and company name. There will be two categories; biodiesel producers that buy from suppliers and suppliers of different oils that are used in biodieselmanuafactorers. Some sources to get leads is [login to view URL] and bulkoil.com. [login to view URL] consist of 15000 biodiesel buyer and users. On the left side you also see different types of oil that are used. These will be a search criteria of suppliers. When it comes to manuafactorers/buyers it can be good to make a search words like biodiesel, uco, vegetable oil and other. First of all I am interested in manuafactorers, but of course also suppliers. Tell me what you can do, and how big database you can attract (how many) mail adresses are most important, can you compile a better database with country and company name it will determene the price