I'm sorry your having a tough time with your Dad. It is a tough thing to do. I have been through 3 cancer diagnoses myself, as well as loosing both parents to cancer. I know it's tough.
If you need help or have specific questions post them in the questions tab at the top of the page, and lots of great people here will help out.
Thanks for posting, please know that while it is hard now, you will one day feel good knowing that you were there to help when Dad needed you.
Let us know how we can help, happy to do what we can.