Would definitely recommend purchasing a helmet and good snowboarding specific gloves. Rent your board and boots until you’re sure you’ll stick with it.

The new gear is great. I snowboarded in the 90s and dropped off in college. Started back up 8 years ago using my same 90s era Burton LL Bean edition A-deck then after a couple years upgraded to a Burton Flight Attendant and it was a HUGE improvement.

Some mountains occasionally host demo days with Burton or other makers. Take an opportunity to try different types or rental and demo gear, and get advice from your instructors before you make a decision on buying your own gear.