First try getting kerrigan or swan at the begining works best with them
Make your barracs to somehotkey (i use 5) and rally it up to the entrance
Push out as soon as you have enought energy for buffs
In the begining kill rines cuz you don't have enought firepower to hero snipe yet(unless you trap them alone) do 1 atack then 1 armor and repeat till you get 5-6 atack and armor the stop making upgrades and tech straight to tanks as fast as you can and start upgrading atack and armor again
Ah yeah buff your army non stop and use 3:1 Str to agility for kerigan and all agility for swan
from that point foward you pretty much won the game unless you got it too slow.. if someone gets thors that's okay cuz he in 99% of the cases will be with 3 times less upgrades and your tanks can crush his thors (getting more money for it too^^) to get your own modified by LasTCursE
i prefer Swan+Kerigan+Kerigan since if i get a shit spell like toxin or fire on my army and don't have regena right away the other guy can give me.. :) besides warpig has good spells but sucks as a hero cuz it's the easyest hero to kill in the whole game
Got a 9-1 Killstreak on footy with Marine+upg Kerrigan as hero (and ALOT OF HERO SNIPING) when you get to around 5-6 or above switch to lings or better to hydras if you have the money and from that point foward you pwn everything on the map no matter hero or unit lol