Hey there @quasixx ! Rookie animation professional here! Seeing a lot of good advice here along the lines of coming up with a pitch for your feature. If you are indeed interested in pitching your idea to studios I would look up different articles on pitch processes. Cartoon brew, a news site used by students/industry professionals/enthusiasts has a pretty good outline for what you can expect and should prepare for a pitch: https://www.cartoonbrew.com/how-to/how-to-pitch-and-sell-an-animated-series-part-1-setting-up-163522.html
Being able to show you have thought out the process is the most important part. Character designs and descriptions familiarize studios with your characters, example background layouts, and a few still images of what a finished frame of the final animation would look like(also called a vertical slice) are all good things to have. 2-5 min of voiced(whether professionally or temp audio) animatic or finished animation are not a bad idea either. You will also probably need to think about things like a projected production schedule, what platforms you want to stream or broadcast on, and other business type stuff like a budget(because you are essentially asking studios to partner with you for money and labor). You can look up examples of pitches online.
I would be careful and take a day to research what goes into producing a feature animation to avoid devaluing the work of any artists who would be interested in joining your team for putting together a pitch should you decide to do so. I would seek a collaboration with a small team of artists, as it will be hard to find one person who is both competent and confident in their skills for all aspects, and I would consider coming up with a small budget to pay them for their work. If you can convince them to join your project long-term(ie. if and when your story is picked up) they may agree to work out compensation after the fact, but that is a big maybe if you are working with strangers. Just remember to treat your collaborators with respect and listen to their ideas and criticisms. You don't have to give in to every criticism people give you, but the core idea of your group should be that you are all working to make the best thing possible.
For a complete feature, the labor required is immense, and the money and time required is just as great. unless you plan on building your own studio from the ground up(which is big $$$), going through a pitch process is probably the way to go. These days a lot of this process is done remotely(for obvious reasons) but in better times you may be expected to make appearances in front of studio executives so this is the time to brush up on your presentation skills aahah! Dress professionally, and be sure that you present yourself as respectful and as someone who would be a joy to work with. Have confidence in your work and be ready to explain and defend your choices but be open to criticism and thank the people you are meeting with for their input. I've seen entire theatre rooms turn hostile on people with egos, especially for folks without previous experience.
Look through the credits of some of your favorite cartoons and find out what company produced them(usually all the way towards the bottom). All of these studios have websites, and you may be able to find out if they have pitch processes available to the public. The good news is that TON of animation is being produced in canada, many studios working out of Vancouver and Ottawa. Again, do your research and try and figure out if your project would be appealing to a chosen studio, if it fits with the work they are already producing, or if you would want to collaborate with them in the first place.
Its a lot of hard work to make your dreams come true and if you choose to go down the pitching route, be ready for quite a bit of rejection. don't let it discourage you though! Each time you try you will be better, and you can always ask for feedback to make your pitch better the next time. There is no such thing as waisted effort, and even if this project doesn't get through, I'm sure you will continue to write and maybe someone will be interested in those projects and you will have the chance to use that experience to return and try again with this one.
