You will probably go 3 or 4 grunt tech build if you're running the cookie cutter strat. The key is to keep pressure on them by harrassing with your Blademaster by finishing their creeps or hitting their workers. You want to keep them down and under strain so attacking you is the last thing on their mind. If you're playing human their peasants are generally open but watch for arcane towers which will burn your mana quickly. Depending on the size of the map humans may also try to play a quick tower push with ivory towers and the like. If you suspect that you should try building a tower or two and hold out until you reach tier 2 for demolishers. The Human vs Orc matchup usually leads the Human player to try a caster spam if they don't tower rush. They tech quickly after 5-6 footmen and churn out a lot of priests and sorceresses. Sorceresses will spam slow on your army because of the archmage's brilliance aura. If not dealt with, slow will usually turn the battle against your favor. Their priests will easily heal any damage your sluggish melee units inflict while their magic damage does bonus. Bloodlust sometimes works but it is a risk because they can easily start building spell breakers along with other casters to steal your bloodlust. This is why you want to tech to tier 2 as soon as you build a few grunts. Right when you hit stronghold you want to build a spirits lodge to start building and upgrading spirit walkers for disenchant. If you survive the caster spam the rest of the game develops differently. Most of the time I see human players with gryphons and knights and the orc using kodos to counter the knights.
When fighting undead you can force them to waste money on a nerubian tower and time by windwalking in and hitting the acolytes around the gold mind while they are gone. Orc vs Undead is basically a free win for the Orc unless you really screw up. If you both use cookie cutter strats Orc will win. They will usually tech to tier 3 as fast as possible while amassing crypt fiends and then pushing and change statues to destroyers. As with any battle, you want a nice amount of raiders. I personally like to play a shadow hunter or tauren chieftan as my second hero upon reaching tier 2. Hex and war stomp can both be used during the battle on the death knight to prevent him from coiling his fiends to full health. Once you get a fiend low use either spell on the death knight and finish the fiend off. They can also be used when the Death Knight is weak to prevent him from using his town portal to flee to his base. If the undead player has burrow make sure to use raider's ensnare on the fiends when they get low so they can't hide. I also usually go for a wyvern spam after I have enough raiders as they will rip through destroyes and round off your melee army nicely. You want to try to harrass his acolytes throughout the game. I have also seen orc players use far seer with feral spirits and run them in to the acolytes as they do normal damage and at level 3 they are invisible.
Orc vs Orc is a pretty stupid match in my opinion. Generally you will go for a quick tech again while skirmishing with the opposing army. I usually go for a wyvern spam to catch them off guard before they can build batriders or a kodo spam to devour all their units (Kodo spam is the most common as they are hard to bring down and orc units cost a lot so devour is even more efficient)
Night elf is usually a quick tech to huntresses. Huntresses will tear through your grunts so you want to once again tech quickly to tier 2 and get raiders for their super effective siege damage and ensnare. Night elf bases are vulnerable at the start so it's probably a good idea to go harrass their wood collectors, just watch out for the Demon Hunter's mana burn. Once they tech they will usually go for a dryad and claw druids, morphing them into bears at tier 3. There's no real sure counter for this, but I've seen raiders to counter dryads, wyverns to counter dryads and hit bears unscratched, and even raiders taurens and kodos.