As you know I don't Have much experience with Starcraft 2 so if have more protoss builder or if you have any question just leave a post. Thank you
4 Warp Gate Pressure Build order:
A) 9 ~ Pylon
13 ~ Gateway
14 ~ Assimilator
16 ~ Cybernetics Core
17 ~ Pylon
19 ~ Sentry
19 ~ Assimilator
19 ~ Gateway
19 ~ Gateway
22 ~ Gateway
B) 9 ~ Pylon
12 ~ Gateway
14 ~ Assimilator
16 ~ Pylon
18 ~ Cybernetic Core
20 ~ Assimilator
20 ~ Warp Gate Tech
22 ~ Stalker
24 ~ Pylon
25 ~ 3 Gateways
First units: Sentries because you have lots of gas left over. Also your sentries will have enough energy to force field.
Second : Keep producing units if you want you can save your chrono boost for Warp Gates.
You need to use your force field useful because it is important to control the battle.
Last: Enjoy killing people with this build order. (Easy to pull it for bronze to platinum, it gets hard after diamond league)
BTW this build order is not good against someone rushing you. (Zealot rush, Zergling rush, Marine rush)
Peace,
-BloodHunter