Protoss have the strongest basic unit in the game. For 100 minerals and 2 supply, zealots can be created in masses and very early in the game. Their shields and psi blades which cause 16 damage are very effective early in the game and a good rush can devastate an enemy right away. Remember to scout first the enemy base. Also, try to send in a probe and construct a pylon, cannons and shield batteries like the one in Killer Outposts.

• Mine with all the probes.
• On the 8th probe, build a pylon and a probe.
• Build two gateways.
• Build probe, gateway.
• Build probe, pylon, pylon and 2 probes.
• Pump more zealots and probes.
• Continue probes and zealots.
• Attack once you have a squad enough to do some damage.
• Go for gas and Citadel of Adun to upgrade speed.