The reality for most aspiring authors is that their writing has to give way to the realities of a full life outside of it. Most of the time, that means squeezing in time in between your job that pays you and other life activities. However, sometimes you can get lucky and have the opportunity to spend a large dedicated chunk of time writing without work getting in the way.
In a Dungeons & Dragons campaign setting context, canon can be defined as imagined world history up to just a moment ago. It can also encompass dozens of smaller stories, as with the Forgotten Realms setting and its embracing of novels as canon. Game setting canon can also include differences from core assumptions. Defining differences can make a game world stand apart from its peers. You just have to be careful where you point your canon.