If your doing a match that has all the AI against you, use the Super Weapon General. It has the best defences and Particle Cannons are much cheaper than normal (2500 instead of 5000). Build EMP Patriots and Garrison buildings effectively to defend your base. Use Alpha Auroras to destroy enemy Command Centers or Superweapons. Hope this helps.
I'm a real C&C Generals Zero Hour addict, so I will submit my favourite base building order here. I mostly start a game with 50.000 dollar starting money. I will submit base building tips for USA, China and GLA. First, I start off with USA.
How to (basically) build your base with:
First, click your command center and build two or three dozers. Spend your first General Promotion Point at a Spy Drone or the Paladin Tank. Start building a Cold Fusion Reactor with your already existing dozer. When your first builded dozer is ready, build a Barracks. When your Cold Fusion Reactor is ready, upgrade it with 'Control Rods' and build another Reactor near it, and also upgrade it with 'Control Rods'.
When your Barracks is ready, start building at least three Rangers, and build also the 'Capture Building' upgrade. When the Rangers are ready to capture a building, send them around your base to capture Tech buildings such as Oil Derricks and Oil Refineries. You will have an advance to the other players if you are the first one who has captured several Tech buildings around your base.
When the second builded dozer is built, start making a Supply Center (if you have built a Reactor) close to your nearest Supply Dock. When the building is finished, make at least 2 more Chinooks to have a steady source of income. Now you'll have: A command center, 2 Cold Fusion Reactors, both upgraded with 'Control Rods', a Barracks with three Rangers (With 'Capture Building' upgrade) and a Supply Center with three Chinooks. Your minimum starting base has been built.
Now build three or more Patriot Systems near any entrance at your base, and build more Cold Fusion Reactor spread out in your base to have enough power available. Build 2 Fire Bases near your Patriots and Equip them with 3 Missile Defenders and 1 Pathfinder. If you don't have a Pathfinder, equip it with a Ranger.
You can also put some groups of Missile Defenders somewhere in your base to have a good Anti Air Defense. If there are Civilian Buildings near your base, send the infantry in there.
Now start building a War Factory and an Airfield. Build four Crusader Tanks and three Hummers with a mix of 2 Rangers - 3 Missile Defenders inside the Hummers (Equip the Hummer with a TOW Missile) and begin defending your base from the entrance you expect the enemy to come from.
Now start a Strategy Center. I prefer to use the 'Search and Destroy' Battle plan, because all your units have + 20% Weapon Range bonus so they can attack enemy units before the enemy can attack you. Build gradually more upgrades at your Strategy Center to power your forces. When the Strategy Center is ready, build 2 Supply Drop zones to have loads of money for building heavy forces lateron.
I recommend building a Particle Cannon as early as it can, so you have an advantage to the other players. The Particle Cannon is also the Superweapon that has the shortest countdown timer, only 4 minutes, while the SCUD Storm has 5 minutes and the Nuclear Missile has 6! So if you can build one early in the game, you can weaken your opponents very much.
So, that's it! Now you have a good working base with protection from enemy attacks. Keep building vehicles and don't forget to build aircraft, they are especially good in slowing down an enemy rush at your base. Later on in the game, start searching more Supply Docks and build another Supply Center near it. Build a small defense near it when it is outside your main base.
I will submit the Base Building Tips for China and GLA soon!
First to do this you can be any nation (but I suggest being the GLA as they can kill the people in enemy vechiles.) First build a couple of light soilders then buy capture building upgrade. If you are the GLA use a general promotion to get hijackers. Ok now make an army of vechiles and put your infintry in humvees, troop crawlers, or the truck thing that the GLA has. Now go to the nearest army and take out their units. Take the infintry and make them capture buildings like enemy barracks and war factory's ( If you have a Jarmen Kell shoot the people out of the dozers instead of destroying them.) After you take their command center or get in one of their dozers start constructing stuff. Soon you can make their weopon of mass destruction.
An awkward thing on Generals Zero Hour and Generals is the build queue. This limits you building more than nine units (vehicles, infantry, aircraft etc.) To overcome this problem, you should build more than one War Factory, Air Field or Barracks. This allows you to make loads of units in a short amount of time.
Start the game as the GLA and build four workers. Tell the first worker to build a supply stash and tell the second to build a barracks. By the time that the third is built, your supply stash should be ready, so tell it to build five workers and tell the first two to set up base defences and arms dealers (bear in mind that this should take less than five minutes). Keep building workers to build defences until they are done and then concentrate on scud storms and black markets until you have enough money to build your army. When facing a USA opponant, build lots of anti air and anti tank units, when facing China, build heavy tanks, and angry mobs. If facing a GLA opponant, build heavy tanks and light infantry. ALLWAYS build Jarmen Kell, and either put him on a bike or in a battle bus, do NOT leave him in the open, or he will be open to attack from snipers. This plan can be adapted for other nations, but works best with the GLA, because of cheap and quick workers.