Handshakes in American business world: firm grip (not crushing, DEFINITELY NOT a limp/ dead fish hand), 3 shakes, don't linger, that's just weird. One hand both male and female. Shake at most meetings, introduction and follow ups ("Hi Bob, good to see you again"), unless you work together a lot.
I'm in trouble with the yellow flower bit. A female friend loves yellow roses. I call her 'the Yellow Rose of Ryazan' (Yellow rose of Texas joke, it took some time to explain, but she likes it now). A dozen yellow roses...