Zardnaar
Legend
I started with 4e. All you needed was the core 3, or the Essentials core 3. Just like with Pathfinder or any other D&D. Sounds like you needed way more for DS.
Just core 4E was very bare boned though, missing races, missing classes, missing powers and wonky math. Technically you can play it but it is missing a lot.
You could play for years with 2E DS with 3 books.