Suggest Diet Plan To Fortify Kidney Condition

Yes. I recently had to have a kidney removed (cancer) I am looking for diet information (etc) on how to protect and best fortify my remaining kindney. I am 68 years old and otherwise in good health. this has taken me by surprise and I need help - what do I do now that the surgery is over - surgery took place on Jan 20,2015 and I am still recovering. My email is YYYY@YYYY