Greetings young seer,
To master the eldar trickery well, you must watch lots of youtube battle reports from the webway.
Buy magnets. Magnetize those eldar weaponry.
Autarch with Swooping hawk wings is good. The Path of Command + sky leap are good. (last minute objective grabber)
Eldrad: Must buy.
Wraithguards, you may want to get 3 unit of these. Must buy. (Dscythe+Wcannon)
Waveserpents: you may want to get 3-4 unit of these.
Wraithknight: buy 1 for now. For 2k games you may want this bad boy in action.
Faction bonus: alaitoc gives your enemy -1 to hit you if your like 12inch away.
Webway stike strategem: You could deep strike your units with Webway stike (strategem). This is crazy good. You could deep strike your unit in yo-face playstyle.
Remember to play the objective.