arkham-starter.com is an arkhamdb.com deck aggregator site. "Starter decks" requires low amount of Investigator Expansion purchases to build. No matter which expansion you choose to start with first, I hope there is something to get started with right away in this site.
I'm currently testing the deck listing UI (below). The search and filter tool is in development. For now decks are completely randomized from the database with no way to browse them. You can also try out my standalone resources and tools.
Random Six Starter Decks