Dear Umines
Use ordinary portland cement ( OPC) 43 GRADE.If you are able to purchase cement from factory than take the supply from factory.For construction knowledge spent some time, read construction article at gharexpert.com website, where you have lot of material about construction. see link belw
http://www.gharexpert.com/articles/Cement-2008/Gray-Cement_0.aspxhttp://www.gharexpert.com/articles/Cement-986/Purchasing-Guidelines-Cement_0.aspx
http://www.gharexpert.com/articles/Cement-1470/Types-Cement_0.aspx