For Biometrics, just go to your nearest or convenient VAC (create an acct. and take an appointment from http://cdn.ustraveldocs.com/in/in-loc-ofc.asp#locations )and they will take the fingerprints, verify your passports (valid + expired), verify DS-260 confirmation page, ALSO ask 2x2 photographs, Interview Letter (not mentioned in the checklist but they asked me). They don't keep anything.
For Medical, call your convenient approved physician panel (check https://travel.state.gov/content/travel/en/us-visas/Supplements/Supplements_by_Post/BMB-Mumbai.html#physicians) and arrange an appointment with them for medical examination. At the time of scheduling an appointment, they will ask for Interview Letter, 2x2 photographs, U.S address, email ID, contact number, vaccination record (if any). You can also ask them about the charges/fees.
Can someone share their recent experience about bio metric, medical and interview? Also did anyone get their interview letter by mail? If you dont get by mail is the email print out sufficient? Appreciate reply. Thanks to everyone who has been sharing their feedback. Good Luck