DarkBlizz

Lets say you have some stalkers, sentries and templars among other units..
How to blink somewhere and then use storm and sentry shield?
When I get in a fight I have a brain meltdown and dont use anything..
How do good players do it? Have everything on different hotkey or select units individually-that is very hard cause all mesh together.
I think zerg is the easiest to play so far..

I dont understand whole ai thing..
There is ai in the game that just needs to be enabled but what do those files with improved ai and stuff do?
Isnt it blizzards job to improve ai or am I missing something?