Writers work in different ways
Type No. 1
These writer know exactly what form the writing will take. They know where it will start, they know the main events or points they want to make within the work, and they know the end.
Type No. 2
These writers know very little. They start with an idea. Something has inspired them to write about something. They know what that something is, but it is only an idea. They most often don't know how it will end, or what will happen in between.
And other Types
There are also many who could be placed on a continuum somewhere between the two. For instance, some will have ideas of some conflicts they want to portray, or some points they want to make along the way, but they don't yet know where it will start. Yet others will know the end, but not how they intend to get to it.
Some even work in different ways on different projects.
Whatever the type, understand that a lot of work happens before the first word is written. This is legitimate research, even if it is only thinking things through and making rough notes. It is called pre-writing.
You need to place yourself. You will in time, get to know what is best for you. It is important that you find the way that is most comfortable and most productive for you. Remember that there is no right or wrong way and don't let anyone tell you otherwise.
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