generally the enemy arn't thinking about presuring you in the first 10 minuts.
Earlier i had a full 6 vultures out in 12 minutes with only 2 bases, one of which i didnt build untill 10 minutes in. By 5 minutes i had quad reactors and was just starting to build my first vulture.
My walk through:
Strategy: VULTURE/GRIZZELY RUSH
Leader: Forge
Ideal map: Fort Deen (but it will work on the others pretty much equally)
key:
Build
Upgrade
Train
Research
DONT DO
1) build 3 supply pads and send warthod out to scout resources
2) when you can, build a fourth supply pad and a reactor
3) upgrade to fortress
4) build a second reactor and a vehicle depot/air pad
5) Upgrade reactors when you have the resorces (do not build anything yet!)
6) (Grizzely): upgrade to canister shell (Vulture): train a Vulture
7) (Grizzely): keep upgrading untill you have researched Grizzely (Vulture): build vultures untill population max and upgrade to Mega barrage
Build a second base with a field armoury and supply pads and one barracks
9) (Grizzely): Train Grizzelies untill population max (vulture): Research Reinforcements and build extra vulture
10) Train Spartans (vulture): build 2 Hornets (putting spartans in them is optional. Both have Pros and cons.)
11) Wait untill allies have armies, while you are waiting, spend spare resorces on Turrets, Carpet bomb upgrades, adrenaline etc... If you do not wish to wait skip to step 13....
12) signal allies to attack bases with their units.
13) Search and destroy REMEMBER: To get maximum points, destroy base buildings before destroying the base. If your allies are also attcking the same base and not bothering about the surrounding buildings, Caniter shell/ Mega barrage and carpet bomb to destroy the base before your ally.