Mirza, I agree with Jamil, the ELISA Guidebook 2nd ed.pdf [John R. Crowther, Springer Protocols - Methods in Molecular Biology 516] will give you all necessary information to validate your immunoassay. Good luck.
Best thing is to follow any company literature; so you will get the working protocol. Check with E bioscience or BD Bioscience ELISA kit ; you will get ELISA protocol to work with. They will provide with sandwich ELISA protocol which you can set with your antibodies and antigen.