EC2 is not persistent. It uses ephemeral storage and they're pretty clear about it.
The launch is not that complicated - it's 7 pages, most of which you can ignore to go with defaults. You're interested in what you're running, what size, network security, and storage - that's about it for the start.
Maybe you need to just take a break for a while... anger and billed services don't mix well :) Alternatively, if you're just testing, make sure you click "free tier only" at the beginning.