New to eBikes - where to start?

Hey everyone!

Just picked up my first eBike, an AiPAS model, and I'm super excited to finally join the club! I've been eyeing these for a while, mostly for my daily 10-mile commute which has a few decent hills. For those of you who've been riding AiPAS bikes for a while, what are your absolute must-have accessories or first upgrades you'd recommend for a newbie? I'm thinking about things like better lights, a comfy seat, or maybe even tire upgrades for mixed terrain. Any advice would be awesome!