About the route order, don't be afraid to just go with your gut. Part of what makes this game special and fun is the unique way people experience the story and how you may react to plot relevations based on the info you're given.
I played flynn's route first, the one that people usually recomend somewhere last or middle but this ended up becoming my favorite game ever made because the story is structured in a way were a route order won't have a negetive effect on your playthrough.
I've never seen anyone like echo anyless because of the route order they played. The "reccomended" order is there but the fact that I've seen around 5 different versions of it shows you should be fine to go about the game how you want and it's only there for people who want a curated experience.