The hardest thing I found with playing Flamenco Rumba is getting the wrists loose and timing right for Rumba rhythm. If you´ve never tried any Spanish or Latin rhythm guitar before, it´s certainly worth looking closer, when a guitar is delivering not just a flow of chords but also a driving rhythmic beat simultaneously, it captivates an audience tremendously.

Here is a videos and technique that I personally found useful when learning how to play Flamenco Rumba.
Playing the basic Rumba rhythm. This is an =>
excellent video for learning the Flamenco Rumba.