Swarfendors Unofficial Manual should come in handy- with no need to buy:
As well as having the forum in general to tackle issues one issue at a time with specific help.
I would suggest that Zorin OS 9 is too outdated by now to try salvaging.
Just about any DVD burner utility can be used to burn a bootable ISO to disk. You do not need to be an expert on ISO files:
https://help.ubuntu.com/community/BurningIsoHowto