What personally helps me if I don't know how to draw a thing:
Look up a couple of references, put them next to each other. Then look up a few tutorials, put those next to each other.
Why do I want to stress a few and not just one? Because that way you can get a variety of perspectives (angles, but also how other people tackle things). From this, you can then create your own style, your own perspective, as you would have several different ways for you to work from.
So, if you want to draw an anthro fox, think of a few ways you can try to tackle this.
Example: Looking at how to draw fox heads (feral and anthro), looking at how to draw anthro's in general, and looking at how to draw fox anthro's in particular.
Also, what style are you interested in drawing?
Some examples are: Realistic, Semi-Realistic, Cartoon, Anime/Manga.
You can also look up how foxes are then draw in these various styles to get a good visual reference.
But most importantly: No matter what style you decide to go for, always keep some realistic references nearby of the creature or thing you want to draw, as a reminder, as it were.
Here are some examples on drawing foxes:
Fox head sideviewFox feral body, but check the head if you only want the headEar TutorialAnthro Head TutorialYou can see many indeed start off with basic shapes, this is to indicate whereabouts everything should go and also sometimes the proportions.
If you intend to make your fursona drawing in anthro form, with human anatomy, then you could also look up anatomy pictures, pose references, guidelines on proportions, etc. ^^
Hope this all helps o3o