Awful news for you and your family, but glad you’re in fighting shape and up for kicking this in the arse.
I’ve had my mum and best mate go through the same process, the only advice I could offer you is to lean on those around you as much as possible, it will make things easier for you and, strange as it sounds, it will make this easier on them too. One of the hardest things I found was not being able to help, just having to stand and watch them go through it, so the more I was able to do (even just trivial things), the more positive I felt since I was at least doing something.
You’re in good hands now. I hope everything goes well, I really do.