Check out ur Passiv.
Q - W - Q - E or R - Q - E or R - Q(1v1)
Q - R - Q - W - Q - E - Q (Teamfight or 1v2)
W - Q - E - Q (if jungler ganks ur line in early and u have to CC the enemy)

I think u can see the combo strategie.

Buy any recall until 25 min new healpots. U can choice BootUpgreat. If u winning u got magic pen boots if u looseing u got magic res boots. u can buy in early and mid game wards.

in early u have to lasthit with autoattacs if u got ur tear of the goddess u have to "spam" spells. use often ur Q to farm. normaly u get second blue so itz np to stack tear fast to 100-200 mana. in late u dont need the blue.