Everything split into two honest tiers: essential (you can't ship without it) and optional (add it later, once volume justifies it). The headline you can take to leadership: the essentials run a few hundred dollars one-time, and every piece of essential software is free.
Physical equipment. The essential list is the minimum to photograph, pack, and ship a real item. The optional list speeds things up once you're doing volume.
The good news up front: everything you truly need is free or already included. The optional tools are subscriptions you only add when scale makes them pay for themselves.