For most range lanes ur combo will look like this: E > W mid air > Q run away with phase rush

All in combo: q > e > 3 autos > w > 3autos
All in combo lvl 6: q > e > w > r > put as much autos as posible > follow them with 2nd

Diana laning phase isnt the best, you should rather aim for scrimishes (small team fights in river, jungle or botlane)or roam. Dematerializer might help u with wave clear, but I dont recommend taking it. After level 6 Diana is incredibly strong in fights, if you use it well its ability to turn apparently lost skirmishes in unexpected wins is huge. If you have srong early game jungler you should alaways help him if he 1v1's someone in river, good example is fight over 1st scutler if you win 2v2 you get free push and good early recall. Your goal as Diana is to unleash your full potencial in fights and snowball the game.

There are 3 main ways to use tp
1. Tempo reset - Use tp to refresh your resources and buy cheap item like darkseal. If you heavy trade before reset it will put your enemy laner in really bad spot.
2. Tp for wave - If you got killed for example and enemy crashed big wave under turret its often worth to tp. There is not much to talk about it
3. Tp roam - Its my favorite way to use tp. How to do it correctly?

Scenario nr 1 enemy botlane pushed wave and there is a ward behind them, before you tp you should make sure your botlane is able to fight(if the have no mana or low health you shouldnt tp cuz u will die 1v2 cuz diana isnt strong early game and you will put yourself in bad situation)

Scenario nr 2 Your botlane got ganked and you see your jungler counter ganking, if you can u should alaways try to do it cuz there is small chance you will lose 4v3 and if u will you can take 1st turret or drake