Father recently diagnosed-what next?

Hello,
I found this site yesterday, thank goodness! My father was diagnosed a couple of weeks ago. I’m devastated. This is a man who was pretty much my sole parent. We are very close. I really thought we would have more time together in our lives. I am at that really raw stage of shock and grief- crying at the drop of a hat, etc. And I have so, so many questions! I don’t even to where to start, so any guidance would be much appreciated. Thank you