This is pretty straight forward. Start the game like you always would. Get whatever units you wish to rush with. Also, get at least 20 medics. Send the medics in first, with your army close behind, mixed in with more medics. The enemy units will fire at your men, but a lot of thier shots will go for the medics. Those 3 seconds play a huge roll in the survival of your army and the enemy. The only weakness here is if the enemy targets one specific unit, but if that happens, some of your army simply won't be shot at.

CreepColony's Opinion: Be sure to make the medics heal each other.