what do i need to do to file a law suit against a DR who damaged my kidney?

You neeed  to discuss the viability of your case with an attorney with experience in the field. Medical negligence cases are very expensive to pursue and there are special rules applicable to those cases that differ from common negligence cases. You should be particularly careful regarding the statute of limitations applicable. With some exceptions, the limitations period is 2 years from the date of your injury or the negligent act.