Don't buy anything until you need it... some of the stuff expires...
OK, if you are building you might need a firesuit... try to not outgrow it... Helmets are on a 10 year cycle... Snell SA2010 expired in January, 2015 will probably expire Jan 2027 but I think the extra year was due to Covid and supply, so they could move back to regular schedule. If you need a fit up helmet I have a couple than have used up their 1 crash.
When ready to buy belts, parachute, arm restraints, I agree DJ is the spot...