Let me introduce you to a Trek writer’s biggest asset. This is Memory Alpha. It has every scrap of canon known to man in an easily searchable and readable format. It is a well maintained and neatly formated wiki. Canon is drawn from TOS, TAS, TNG, DS9, VOY, ENT, and the movies and organized by universes, too (alternate, mirror, original).
Its close cousin is Memory Beta. It includes everything considered optional canon: “novels, comic books, RPG sourcebooks, video games and any other licensed works.”
Birthdays, education, past relationships, relatives, fears, accomplishments, family, childhoods, aliens, planets, the science behind trek… everything. If it ever happened in any official Trek source, it’s searchable in these two places.
These are really excellent resources because NO ONE expects any writer to have seen every bit of available Trek canon. Even if you have, *remembering* it all would be an impressive feat. There’s 50 years of canon available that spans hundreds of years in-universe.
Also, I’ve found that most long-time Trek fans are pretty easy going about a lot of canon. They might mention like, ‘Hey, in canon, so-and-so was born here but actually raised there…’ or ‘Hey, in canon, X’s birthday is….’ but if you’re married to the idea of something else… well, whatever. Do what you want. Just know the resources ARE available to you if you so choose.
ANYWAY, the main point is: don’t let all the canon intimidate you. Write! If you make a mistake, it’s not the end of the world. Tap your resources, do your thing, and in the end, all that matters is a good story and good characterizations. The details just make it fun for us long-time Trekkers. We’re geeks like that. ;)
Also, to my followers, I am always happy to help out if you have any canon questions. <3 I’m not an expert by any stretch of the imagination, but I’ve been a fan of Trek since I was in diapers, so I know some stuff.