New to eBikes - where to start?

Hey everyone!

Just joined the forum – super excited to be here! I'm completely new to the eBike world and just ordered an Aventon Pace 500.3, which should arrive next week. I'm planning to use it for commuting about 10 miles each way on mostly paved paths, but also some light gravel trails on weekends. For those of you who've been riding Aventons for a while, what are your absolute must-have accessories or first upgrades you'd recommend for a newbie? Looking forward to hearing your tips!