Only put 1 point in Q and then never again until necessary. At lvl 2 you build depending on whether you have to play offensive or defensive in lane depending on your opponent, but by 3-4 you should have 1 point in the initial 3. I prefer W first but I'll level W + E evenly if I need the extra shield. The majority of her damage comes from her great mobility(thanks to Q + E), her stun plus the excellent damage from her passive to auto attacks. When you get the hang of weaving auto attacks in to not waste charges you'll notice the difference in her power. The combo that Aero posted is pretty standard and you've played Renekton it's practically the same thing(dash in, W to stun, Q for an extra hit, dash out which is normally possible) and it's just as effective.
Item wise I'll generally just go Dorans + Brutalizer/Wriggles(depending on matchup, preferably Brutalizer) + Tabi/Merc treads, start towards BT.
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