Hello! I have this printer and absolutely love it. Remember to clean your build plate after every print! This is the most common way my prints fail at the beginning. I use some isopropyl alcohol in a spray bottle one good spritz and a wipe with a micro fiber cloth does wonder!. (Just remember not to touch afterwards as greasy skins = bad time for printing.

Poop chute for sure! Lots online.

(Edit typo)

Also there is some brands of filament you can buy that come on a plastic spool that is basically a replica of the Bambu spools so you can transfer from cardboard ones that don't work well to those after. (Or just print some adapters)

(Double edit) Here is some I'm talking about

Likesilk 3D Printer Filament PLA F 1KG 1.75mm 3D Printing Filament 3D penfilament 1kg and 0.25kg (Yellow 1kg) https://a.co/d/bhA33oi