Main combo is a simple AA - Q - AA auto reset. Outside of All Out, Q is a partial AA reset, but in All Out form Q is a complete AA reset, making this much more effective. Q cooldown later in the game is nearly exactly the cooldown of sheen proc, allowing you to proc it perfectly on time.

Long combo is E dash to reposition if needed, Q, auto, Q, W to avoid predictable CC and knock enemy closer to a wall, R into wall, then Auto-Q-Auto to your heart's content, weaving in a W for damage mitigation or to avoid CC since the CD is refreshed after going All Out. Use E to escape across a wall, since in All Out it can cross terrain.