New to the smoker life

I came across this Pro 22 on FB Marketplace yesterday and picked it up for $325. Brand new, never used, was won as a raffle prize and not needed. Think I did pretty good.

This is my first smoker of any kind, so I’m curious as to any must-have accessories. I’ve already got the cover and drip pan/bucket liners. Will likely also get the foldable shelf soon. Anything else that the more experienced smokers here recommend?