Goal: Write a novel

[Dox17]

I don't want to start writing it until I have a very solid world, solid plot, and solid characters in place.

Seems like you're setting yourself up for defeat. Personally I think the best approach is to build from scratch and let the characters form as you write. Create a rough draft of the novel with a basic premises with basic characters and as you write you'll be able to see where you want to take the story and articulate the specific traits of your characters as it comes together. Waiting to write anything before you have a complete book in your head doesn't seem to be the right approach. Writing something basic then editing and adding to it will get the ball rolling. 

I also recommend the book War of Art to anyone in the creative field.
https://www.amazon.com/War-Art-Winning-Creative-Battle/dp/1501260626

---

I've always been someone who preferred to right short stories, to be honest, as I just don't have the focus to dedicate myself to a full-sized novel.

Ernest Hemmingway's book of short stories is great for those who just want to read for an hour or so or find the story bland.