Possibility MIL has MM WHat questions should we ask her doctors

Good afternoon all, We were recently told that my Mother In Law may have Myeloma. She had a fall that landed her on her Butt however it fractured her sternum so the doctor ran some blood tests which he said came back suspicious. He wants her to do a Bone marrow biopsy and he mentioned Myeloma to her. She will be 80 yrs old but is healthier and more active than most 50 yr olds. My question is what questions should we be asking her doctor? I am a recent Breast Cancer survivor and am familiar with chemo, but not at all familiar with this disease. Any assistance here would be so helpful!

Thanks in advance.

Sandy