In PCBNEW:
PgUp and PgDn or Shift V to switch component/copper side when laying tracks and vias (to place via start on component side, drag track, right click to place via and then track continues on copper side)
F1 zoom in
F2 zoom out
F3 redraw (across also all kicad apps)
F4 centre at cursor
and further see also: http://xtronics.com/reference/kicad.html
TODO: check SMD sizes and quartz surface mount footprint