I broke a couple of spokes on my wheel, now it's all bent, how can I align it back again? What kind of tools do I need to do a good job?
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You will need one special tool: a spoke wrench that fits the size of spokes you have. While a truing stand is great, you can do some basic truing of a bike with rim brake by simply putting the bike on a stand. Spin the wheel slowly and watch the space between the rim and the brake pad. When you have found the center of a an area that is listing to one side, use your truing wrench to loosen the spoke nearest to it on that side ¼ to ½ turn, and tighten the spokes on the opposite side an equivalent amount.
As long as you work in small steps and work slowly, it is safe to play around and figure out how truing works.
The basic tool you would need is a spoke wrench. This will allow you to pull the rim (by the spokes) back into true. The spoke wrench is actually turning the spoke nipple out at the rim. The tool you would need in order to tell if it is true is a truing stand. The tool you will need to make it all work is your brain. =-]
For your wheel, you'll want to get spokes cut to the length of your wheel by a local bike shop. The length depends on the rim size, the hub size, and the spoke pattern, so the best way to do this is to bring the wheel in yourself. Bringing the wheel in will also help the mechanics to tell you if it is beyond repair - once wheels have bent more than an inch or so, they rarely can be trued to be as strong as they were.
Once you have the spokes and the nipples to attach them to the rim, you can tighten them with a spoke wrench. Once you have the new spokes tightened down, work your way around the hub, tightening spokes to adjust the rim position. Keep in mind that you are tightening the spoke into the nipple, so if you are looking from hub to rim, you want to turn left to tighten and right to loosen.
There's a more in depth explanation of this up on wikibooks, as well: http://en.wikibooks.org/wiki/Bicycles/Maintenance_and_Repair/Wheels_and_Tires/Truing_a_bicycle_wheel
As per the other responses, the main tool you need is a spoke wrench. You can use the frame itself as a truing stand.
Other things to note are:
Yet another very-slightly different answer follows below.
I never owned a stand, and don't have the space for one in my apartment. Plus I prefer to do it in the park in clear air with a beer in hand.
(0) This answer concerns only the in-frame method, that is, when you have V-brakes. Why would you true a wheel on which the rim is not rubbing against any pads?
(1) Turn the bike upside down.
(2) Check if there are any very loose or very tight spokes. Your wheel is already out of true, it won't hurt to correct problems. Overtightened spokes may break, while loose ones might rattle when they become even more loose.
(3)Tighten your brakes excessively. That is, unscrew this so that the wheel barely turns and rubs most of the time:
(4) Turn the tire and find the place where it rubs the most. Identify which side it rubs and correct it as others have noted.
(5) Repeat 4. lots of times.
(6) Finish your beer and get another.