Hi there.
You will need an
HQ choice, probably a Farseer, but an Autarch should do until you get going.
Pathfinders are not much use, but your local meta might say otherwise.
Warp Spiders are excellent now, with the warping-out defensive ability and fast warp move.
Harlequins are not in the Eldar Codex any more and have their own. Use them as counts-as as Scorpions or Banshees maybe, but melee is not big in 7th. 'Go big, or go splat'.
Jetbikes are very nice, as missions are often 'hold a random point for a turn, then move to the next one'. Farseer on a jetbike (a Jetseer) can be very good.
And then you get to get proper copies of the books

, as iffy copies can often contain errors.