I’m watching a Singapore Airlines A380 be badass on the JFK tarmac doing a hard stand operation. Air stairs are the way to go
A good headset will last you a while. I personally got a pair of David Clarks when I first started flying and I still have them today, they’re great without being too expensive.
Aside from that, plenty of books, most of the ones I’d name are FAA publications and I personally prefer them over others like Jeppesen. The Pilot’s Handbook of Aeronautical Knowledge and a new FAR/AIM are a good start.