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SklarSpeedlights + Yongnuo triggers is good if you're on the cheap.
Vivitar 285hv is a good start.
There's a big thread somewhere with lots of good info, I'll try and find it.
SklarA bit old, but its a good start.
https://www.newschoolers.com/forum/thread/696088/1337-s-flash-photography-101---everything-you-need-to-know-about-strobes--flashes--and-off-camera-lighting