Ramakrishna, Muhammad,
I usually recommend that people print the PDF version of the PMP application first, review all the data that is required and then go out and gather all the info that is needed.
www.pmi.org/Certification/~/media/PDF/Ce...lication%20Form.ashx
By doing this you give yourself time to review the data before you input it into the online form you can also identify which information you don't have and need to go digging.
So check if you can give an answer to all questions in this form. If yes, start your online application. If no, find the info first.