Indian Passport

Hi all, I am in the processing of applying for renewing my Indian passport from Indian Embassy in Houston. I hold one old original passport, along with the current passport which is getting expired this oct 2019. My question: Do we have to mail my old original passport which was expired along with my current original passport which will be expiring this oct 19? or just mail my current original pp?Also how many photos should we send ( one to paste on application form) and the rest must be just put in envelope or stapled somewhere?Do we also have to mail doc checklist, if so where can i print it? I cant figure out the Nationality Verification form. I plan to only mail, my US residence notary, US visa notary, original pp, photocopy of 1st 5 and last 2 pages of current pp, aplication form. Is there anything else missing?