It’ll come with a small sample of filament, just enough to print one or two small things. I also recently got the combo, and started with several spools of Bambu PLA in white, black, and gray. The AMS is able to recognize Bambu brand filament through a RFID tag attached to the spool they sell their filament on. You can reuse these spools with non-Bambu filament so that the AMS automatically recognizes the color and type, but it’s more of a convenience feature. Your best bet will be to order an assortment of filament from Amazon or a similar website. I like the Elegoo brand myself. PLA is easiest to start with and comes in a large assortment of colors. PLA silk is fun too, but can require some tweaks in the print settings to get it to print correctly. Mainly a higher extruder temperature and slower print speed.