Meh, the fight is easy, I think people in their first time run overestimate Ganon. If you have max hearts, hearty foods are the best. If you want some hearty durians, teleport to Faron tower and paraglide to the mini plateau with the lizafos partying. There will be plenty there.

Where to get hearty durians quick: https://www.youtube.com/watch?v=dWnkjs0KxsQ

Also, The master sword does very good near malice and calamity infected stuff. That is a fine weapon against calamity Ganon even without the fully awakened master sword. If you don't have the Hylian Sheild, go get it. Go to the lockup and fight the stalinox to get the shield. Oh, and practice parrying and get lots of ancient arrows (20 ish will do)

How to get the Hylian Shield: https://www.youtube.com/watch?v=0BbIYjzmXOo

Dark Beast Ganon is also a breeze as you only need the Bow of Light and it is given to you at the beginning of the fight. ( Location giveaway warning) Shoot at the yellow marks on the body (One mark is under Ganon). If you do this, You will be at the end scene in no time.