Beginning with WS2812B you might want to use FastLED (former FastSPI_LED).
Control all known (https://github.com/FastLED/FastLED/wiki/Overview) LED stripes using this single library by adjusting a few lines.
Base examples are quickly set up.
Since im located in Germany I found WS2812B on eBay (Aliexpress cheaper if waiting time does not matter).
Great experience with ebay seller composite-point.
- FastLED (Great documentation and download latest version)
- FastLED Demo Sketches (more than the base examples contained in FastLED)