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I would second the other recommendations on this post to start with the official book (https://doc.rust-lang.org/book/). I would say reading the first ~15 chapters (+doing the exercises) would give you a good baseline from which you should be a position to start experimenting independently without constantly getting stuck (you'll still get stuck, but having read this far into the book you'll probably have a decent idea of what it is that you need to lookup to get yourself unstuck). I'd budget 2-3 days if you're quick, maybe a week if you're slower.
After The Book, my advice is to read Learning Rust With Entirely Too Many Linked Lists, which helps to solidify your understanding of what Rust's rules mean for writing data structures, rather than using ready-made ones off crates.io.
Hosted documentation for 3rd party crates https://docs.rs
I don't trust your qualitative "LARGE" for the project. I would recommend you pass your project through something like a software metrics tool https://github.com/boyter/scc to better measure what you're up against in terms of Flutter/Dart AND Rust code base.
If you're brand new, in addition to the other suggestions, I think this book could also really help: https://www.zero2prod.com/