There are two different ways I like to play the hero. Either as a spell caster or a right clicker. Based on the other 9 players in the game you should make a judgment call to decide what playstyle works for you!
Skill build: Max Shadow Strike first if your enemy stays in lane with you. If your enemy is clearing waves then max Scream of Pain so you can clear waves and farm faster.
Items Spell Caster: Eul's Scepter of Divinity, Aghanim's Scepter, Scythe of Vyse
Items Physical Damage: Orchid Malevolence, Maelstrom, Black King Bar. Upgrade to Bloodthorn and Mjollnir.
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Qojqva's extensive guide to Queen of Pain. Inside you can find everything you need to dominate the game with QoP (updated for 7.20):
A Storm vs QoP mid matchup guide by Captain Iceblock - a top 100 Storm player on Dotabuff's player rankings.
An Ancient QoP replay analysis by Cookie focusing on winning the mid lane.
An advanced mid lane matchup replay analysis by Cookie - QoP vs Arc Warden.
D2 Bowie's analytical video about Dendi's Queen of Pain gameplay.
D2 Bowie's analytical video about Areezy's Queen of Pain gameplay.