Unfortunately you won’t really know what would be best for your uses until you know your uses. Unless you already have certain kinds of projects in mind, PLA is probably a given but other filament types may or may not be of interest.
PLA seems to be the easiest to print with the most success. Other filaments can drop you right into controlling filament moisture levels with drying and storage issues, and other more specialized issues with chamber heating requirements, etc.
For my own purposes PLA was a great place to start and to start learning. Besides a quick order to buy more PLA colors, I quickly saw a second AMS was going to be very useful and opened up prints of 5 to 8 colors.
PETG HF has been a good filament for outdoor stuff with higher temperature and UV tolerance than PLA but it is a bit more advanced because of the drying requirements to get good prints.
As long as you’re diving into this, there’s a few threads you might be interested in. One is a warning of sorts with how Bambu is now securing filament to spools when winding. Unfortunately they use tape now that can sometimes get pulled into the AMS feeder mechanisms. Definitely non-ideal but you need to know about it.
https://forum.bambulab.com/t/tape-at-the-end-of-spool
You should also look into proper filament storage. These printers are high performance machines and moisture is an issue even with PLA. It may not be an issue for you if you live in a mostly dry area. But if you live in high humidity, this will get important, and is especially important with hygroscopic filament types.
https://forum.bambulab.com/t/what-do-you-find-best-suits-your-filament-storage-needs
Last, if you start seeing moisture issues or want to print PETG HF or other hygroscopic filaments you’ll get to learn about filament drying. It’s a complex topic but just know filament fresh from the shipping bag can have enough moisture to cause print issues. Fresh from the bag doesn’t guarantee dry.
There’s lots of threads here on drying and it’s a little confusing. Most don’t see much problem. In my case, I had print problems from moisture gradually start growing in so had to learn. Might want to check them out to recognize moisture issues if/when you start seeing them.
It’s definitely a fun, unique, and rewarding hobby. The color possibilities totally change 3D printing.