1) Take out EVERYTHING from ur car, empty the glove box and other stored things.get a friend to drive ur car at normal speeds and try to narrow down the place which still give noises.u might be able to fix some at the spot, point out the rest to a good denter/mechanic.
2) it costs around 450rs i guess plus 150rs labour.im not sure about rates though.got mine changed few months back though.its an easy 20min job.
3) replace the tires with some good soft yokohama once. S drive or any other well reputed soft tyre.
4) there can be hundred things wrong with the suspension so cant say what exactly it is.get it checked.
btw, are u sure ur car is 65k kms driven? the generator bearing of my car (bought brand new) gave up at 160,000kms.