First, document creation, on its own, isn't a countable noun, so you shouldn't use a in front of it.
Second, next isn't normally used in this way. When referencing something, you typically give a specific reference, you use a sentence with a demonstrative or imperative, or you use following or (sometimes) below.
There are several variations of an introductory sentence that would sound better:
Figure 1 shows an outline of document creation.
The document creation process is outlined in Figure 1.
Document creation can be outlined in this way:
Consider this outline of the document creation process:
Look at this outline of document creation:
An outline of this document creation process follows:
An outline of document creation is below:
There are many more variations that could be provided.
I would advise against using next in this specific context, although there are ways it could be used:
Next, consider this outline of the documentation creation process:
Next, we will look at an outline of documentation creation:
When used in this manner, it becomes acceptable because it is introducing the sentence itself rather than directly referring to the upcoming outline.
Having said all of that, the use of next is not outright "wrong." But it is uncommon enough that, stylistically, most people would take issue with it, and want to rephrase the sentence.