What questions should I ask?

Hello everyone. Everything has happened very quickly: 12May I contacted GP by email as I has some blood in my pee. Next day he replied arranging cystoscopy in the local hospital. That showed no abnormalities. Then came a CT scan of my abdomen. A phone call from a nurse specialist informed me that there was a growth in one kidney, they had had a multidisciplinary team meeting and wanted a chest scan to check no spread and that the current thinking was kidney removal. Yesterday I had the CT scan of my chest. The day after tomorrow the Urology consultant is phoning me at home. Any advice, please about what I need to know and what questions to ask?